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Let’s say that your company is running a standard control and variant AB test on a feature to increase conversion rates on the landing page. The PM checks the results and finds a .04 p-value.

How would you assess the validity of the result?

Experiment Validity

You are testing hundreds of hypotheses with many t-tests. What considerations should be made?

What is a key disadvantage of the F-test when compared to multiple t-tests?

What is a key disadvantage of the F-test when compared to multiple t-tests?

Hundreds of Hypotheses

You are testing hundreds of hypotheses with many t-tests. What considerations should be made?

Let’s say you work for a social media company that has just done a launch in a new city. Looking at weekly metrics, you see a slow decrease in the average number of comments per user from January to March in this city.

The company has been consistently growing new users in the city from January to March.

What are some reasons why the average number of comments per user would be decreasing and what metrics would you look into?

What metric could be used to measure if active users are still engaging on the platform despite an overall decrease in the average number of comments per user?

What metric could be used to measure if active users are still engaging on the platform despite an overall decrease in the average number of comments per user?

Decreasing Comments

How would you investigate a decline in the average number of comments per user?

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Description You have hundreds of thousands of hosts, hundreds of millions of lines of code, billions of online transactions, and one of the most visited sites on the Internet. Now go lead a team to secure it At Amazon, we obsess over our customers and maintaining their trust. To earn that trust in an environment as vast and varied as Amazon's requires the applied skills of smart security engineers and experienced, innovative security leaders willing to tackle never-before-seen challenges at dizzying scales. You will manage a team of talented and energetic security professionals responsible for detecting, analyzing and responding to information security threats across Amazon and its subsidiaries, as a part of a global, follow-the-sun operations team. An ideal candidate for this role will be able to work at all levels, from the theoretical knowledge of physical security principles to the practical application and real world implementation of processes and measures. You must have a proven record of accomplishment in operations room/center dispatching, SOC data center security operations, physical security, customer service; and possess excellent verbal and written communication skills with the ability to multi-task. You should demonstrate good judgement and critical thinking while also being able to follow SOC tasks and procedures utilizing discretion at all times. The AWS SOC is a 24/7/365 operation and shift work will be required to include days, nights, weekends and holidays. Key job responsibilities Security Responsibilities: Lead and coordinate the activities of the Security Operations node located in Seattle, WA to ensure timely and effective response to information security threats Execute security operations processes, identify and measure critical security operations metrics and continually improve the efficiency and effectiveness of the Security Operations Work closely with peer managers in Information Security and Corporate IT teams to identify and implement process changes, improvements and efficiencies and ensure solid security practices Optimize and enhance existing processes with an eye to reducing a high operational load Ensure continuity of operations for security events through effective communications between the global nodes of the Amazon Security Operations Center Work with your peers to assist the Global Security Operations Manager in defining the overall security response strategy for Amazon Performance Management Responsibilities: Create a positive work environment & provide a goal-driven framework for information security success in which team members may achieve organizational & individual performance objectives Own all facets of performance, hiring & career management for the team; regular one-on-one meetings with all team members are required Provide technical & soft skill coaching to maintain a well-rounded, innovative & operational organization Establish training programs for your engineers Supervise day-to-day activities of the team, providing management escalation support as required Track and report on key initiatives being delivered by the team A day in the life This position supports Security Engineers and Technical Program Managers within Security and incident response activities. You will drive 'Tier 1' and 'Tier 2' related issues to resolution across numerous service teams and other more senior Security Engineers. You will need a combination of troubleshooting, technical, and communication skills, as well as the ability to handle an assortment of disparate tasks which may include small-project and software development work. This role will provide career growth opportunities as you gain new security skills in the course of your duties. About the team Diverse Experiences Amazon Security values diverse experiences. Even if you do not meet all of the qualifications and skills listed in the job description, we encourage candidates to apply. If your career is just starting, hasn't followed a traditional path, or includes alternative experiences, don't let it stop you from applying. Why Amazon Security? At Amazon, security is central to maintaining customer trust and delivering delightful customer experiences. Our organization is responsible for creating and maintaining a high bar for security across all of Amazon's products and services. We offer talented security professionals the chance to accelerate their careers with opportunities to build experience in a wide variety of areas including cloud, devices, retail, entertainment, healthcare, operations, and physical stores. Inclusive Team Culture In Amazon Security, it's in our nature to learn and be curious. Ongoing DEI events and learning experiences inspire us to continue learning and to embrace our uniqueness. Addressing the toughest security challenges requires that we seek out and celebrate a diversity of ideas, perspectives, and voices. Training & Career Growth We're continuously raising our performance bar as we strive to become Earth's Best Employer. That's why you'll find endless knowledge-sharing, training, and other career-advancing resources here to help you develop into a better-rounded professional. Work/Life Balance We value work-life harmony. Achieving success at work should never come at the expense of sacrifices at home, which is why flexible work hours and arrangements are part of our culture. When we feel supported in the workplace and at home, there's nothing we can't achieve. Basic Qualifications Bachelor's degree 5+ years of experience leading, managing & developing high performance teams 3+ years of hands-on experience in information security technologies such as continuous security monitoring, anti-malware controls, intrusion detection/prevention, access control & CSIRT-focused systems 3+ years of progressive experience within a Security Operations Center or similar operating environment Ability to work any shift pattern within the 24/7/365 operation including days, nights, holidays and weekends. Preferred Qualifications CCSP (Certified Cloud Security Professional) or CEH (Certified Ethical Hacker) or CFR (CyberSec First Responder) or Cloud+ or CySA+ (CompTIA Cybersecurity Analyst) or GCED (GIAC Certified Enterprise Defender) or GICSP (Global Industrial Cyber Security Professional) or PenTest- MA/MS in computer science/related field Information security professional certifications encouraged (SANS GIAC, CISSP etc.) Experience architecting/operating Amazon Web Services Excellent written communication skills, with a focus on translating technically complex issues into simple, easy to understand concepts Strong information security risk-based prioritization abilities Amazon is committed to a diverse and inclusive workplace. Amazon is an equal opportunity employer and does not discriminate on the basis of race, national origin, gender, gender identity, sexual orientation, protected veteran status, disability, age, or other legally protected status. For individuals with disabilities who would like to request an accommodation, please visit Our compensation reflects the cost of labor across several US geographic markets. The base pay for this position ranges from $157,600/year in our lowest geographic market up to $272,400/year in our highest geographic market. Pay is based on a number of factors including market location and may vary depending on job-related knowledge, skills, and experience. Amazon is a total compensation company. Dependent on the position offered, equity, sign-on payments, and other forms of compensation may be provided as part of a total compensation package, in addition to a full range of medical, financial, and/or other benefits. For more information, please visit This position will remain posted until filled. Applicants should apply via our internal or external career site.

Build your best future with the Johnson Controls team As a global leader in smart, healthy and sustainable buildings, our mission is to reimagine the performance of buildings to serve people, places and the planet. Join a winning team that enables you to build your best future Our teams are uniquely positioned to support a multitude of industries across the globe. You will have the opportunity to develop yourself through meaningful work projects and learning opportunities. We strive to provide our employees with an experience, focused on supporting their physical, financial, and emotional wellbeing. Become a member of the Johnson Controls family and thrive in an empowering company culture where your voice and ideas will be heard - your next great opportunity is just a few clicks away What we offer Competitive salary and bonus planPaid vacation/holidays/sick timeComprehensive benefits package including 401K, medical, dental, and vision care - Available day oneExtensive product and on the job/cross training opportunities with outstanding internal resourcesEncouraging and collaborative team environmentDedication to safety through our Zero Harm policyCheck us Out: Day in the Life of the Building of the Future What you will do We are seeking a motivated and detail-oriented Sr. Product Manager to join our team, focusing on access control software security products. As a mid-level individual contributor, you will play a crucial role in the development and management of our access control software product line, ensuring it meets market needs and drives business growth. How you will do it Product Development: Collaborate with engineering, design, and other cross-functional teams to develop and enhance access control software products. Ensure products meet quality standards and customer requirements Market Research: Conduct market research to understand customer needs, industry trends, and competitive landscape. Use insights to inform product strategy and development Product Roadmap: Develop and maintain a product roadmap that outlines key features, enhancements, and timelines. Prioritize initiatives based on business value and customer impact Customer Engagement: Engage with customers to gather feedback, understand pain points, and validate product concepts. Use customer insights to drive continuous improvement Performance Metrics: Define and track key performance indicators (KPIs) to measure product success. Use data-driven insights to make informed decisions and optimize product performance Documentation and Training: Create and maintain product documentation, including user guides, technical specifications, and training materials. Support sales and marketing teams with product knowledge Stakeholder Communication: Communicate product updates, progress, and challenges to stakeholders. Ensure alignment with business goals and manage expectations. What we look for Bachelor's degree in Computer Science, Engineering, Business, or a related field Proven experience as a Product Manager, preferably in access control or security products Strong understanding of access control technologies and security industry standards Excellent analytical, problem-solving, and decision-making skills Strong communication and interpersonal skills, with the ability to work effectively in a collaborative environment Experience with agile methodologies and product management tools Ability to manage multiple priorities and thrive in a fast-paced environment. #LI-MJ1 #LI-Remote Johnson Controls International plc. is an equal employment opportunity and affirmative action employer and all qualified applicants will receive consideration for employment without regard to race, color, religion, sex, national origin, age, protected veteran status, genetic information, sexual orientation, gender identity, status as a qualified individual with a disability or any other characteristic protected by law. To view more information about your equal opportunity and non-discrimination rights as a candidate, visit EEO is the Law ( . If you are an individual with a disability and you require an accommodation during the application process, please visit here.

Chief Data Officer Office or Project Location Sylmar, CA Company Tutor Perini Corporation Job Code 2451 Tutor Perini Corporation is seeking a Chief Data Officer to join our officesin Sylmar, CA or Henderson, NV. ONLY U.S. CITIZENS CAN BE CONSIDERED About Tutor Perini Corporation: Extraordinary Projects, Exceptional Performance Tutor Perini Corporation is a leading civil, building, and specialty construction company that believes integrity, teamwork, and a collaborative approach are fundamental to our business success. Extraordinary projects demand a strategic and intelligent approach, finely honed through more than a century of real-world experience. They demand the relentless intensity of people who know the stakes are incredibly high. And they demand a team that understands mutual trust and integrity are necessary to execute massive undertakings on near-impossible deadlines. From coast to coast, notable projects include The Purple Line (D Line) Extensions in Los Angeles, SR 99 Viaduct replacement tunnel in Seattle, East Side Access projects and the Hudson Yards Platform in New York, Central Subway Third Street Light Rail in San Francisco, and multiple airport expansions and bridge projects. Extraordinary Projects need Exceptional Talent Description: As part of our continued growth, we are seeking a visionary Chief Data Officer (CDO) to assist our data strategy and AI initiatives, empowering our teams and projects to unlock new efficiencies and insights. As the Chief Data Officer (CDO) at Tutor Perini Corporation, you will report to the VP of Information Technology/CIO and be responsible for developing and executing Tutor Perini's enterprise-wide data strategy, with a focus on harnessing the power of data analytics, artificial intelligence, and machine learning to drive business outcomes. This executive-level role will work closely with senior leadership to embed data-driven decision-making and AI-enabled processes across the organization. The CDO will lead efforts to improve operational efficiency, enhance project management, and optimize resource utilization through innovative data and AI solutions tailored to the construction industry. This executive role requires a hands-on leader with deep expertise in data science, AI, project & portfolio management, and digital transformation, ideally with experience in the construction or engineering industries. The CDO will be responsible for developing a future-ready data infrastructure while fostering innovation across all areas of the company, including project management, risk mitigation, supply chain optimization, and operational excellence. Strategic Leadership and Vision: Develop and execute an enterprise data strategy that aligns with Tutor Perini's long-term business objectives and market positioning. Lead the company's AI strategy, focusing on data analytics, machine learning, and automation to enhance operational efficiency, reduce costs, and improve project timelines. Build partnerships with executives, divisional leaders, and project managers to ensure that data and AI solutions support strategic goals across all levels of the organization. Data Strategy & Governance: Oversee the design and implementation of robust data governance frameworks to ensure data quality, accessibility, consistency, and privacy. Establish enterprise data management practices to ensure data integrity and compliance with applicable laws and regulations, including construction and state and federal contract requirements. Create a comprehensive data architecture that supports real-time data integration and analytics to optimize construction project management, resource allocation, and financial performance. AI-Driven Innovation: Lead initiatives to integrate artificial intelligence and machine learning across the organization, including predictive analytics, project risk management, and automation of repetitive tasks. Spearhead AI projects that enhance construction processes, with a focus on improving project forecasting, supply chain optimization, quality control, and resource scheduling. Identify new opportunities for AI-based innovations in construction technologies (e.g., automated UAV/drone site analysis, real-time project monitoring, and Virtual/Augmented/Extended Reality for construction design and assembly). Develop AI-based models to deliver insights that drive business outcomes, such as reducing project delays, optimizing costs, and improving safety protocols. Operational Excellence through Data and AI: Drive the implementation of data-driven processes across construction, procurement, and engineering teams to improve decision-making and operational efficiency. Identify opportunities for process automation and optimization using AI and robotic process automation (RPA) tools to enhance project delivery and cost management. Ensure that data and AI systems deliver measurable value by monitoring key performance indicators (KPIs) and aligning with industry benchmarks. Data Analytics and Business Intelligence: Lead the development of advanced analytics platforms to provide actionable insights into project performance, cost management, and workforce utilization. Collaborate with project managers to deploy real-time dashboards that track construction project metrics, including timelines, budgets, and risks. Leverage data analytics to identify trends, anticipate project risks, and optimize resource allocation for large-scale infrastructure projects. Team Leadership & Development: Build and lead a high-performing team of data scientists, AI/ML engineers, data engineers, and business analysts to execute the company's data and AI strategy. Foster a data-driven culture across the enterprise, ensuring that employees at all levels understand the value of data and are empowered to make informed decisions. Develop a talent pipeline by mentoring and training data professionals to support Tutor Perini's growth and innovation goals. Transformation and Change Management: Cultivate a culture of transformation within the data and AI functions, encouraging the adoption of new tools and technologies to drive continuous improvement. Lead change management efforts to ensure the successful integration of AI solutions into Tutor Perini's operations and foster a data-driven mindset throughout the organization. Stay at the forefront of data and AI innovations, ensuring that Tutor Perini is leveraging cutting-edge technologies to maintain a competitive edge in the construction industry. Requirements: U.S. Citizenship is required. Master's degree in Computer Science, Engineering, Data Science, Artificial Intelligence, or a related field. Professional certifications in AI, Data Science, Project Management, and Process Improvement (PMP, Agile, Lean Six Sigma) are highly desirable. 15+ years of leadership experience in IT, data science, analytics, or digital transformation, with at least 7 years in a senior leadership role. Proven track record of implementing AI and machine learning solutions within large-scale organizations, preferably within construction, engineering, or a related industry. Demonstrated expertise in leading enterprise-wide data and analytics programs, fostering a data-driven culture. Experience managing large, multi-disciplinary teams, including IT professionals, business unit leaders, project managers, AI/ML specialists, and analysts. Previous experience integrating AI technologies into existing operational systems to drive significant performance improvements. Experience managing vendors, contracts, and cost accounts over $10M. Enterprise-level Program or Portfolio Management experience. Expertise in AI/ML technologies, data platforms, cloud computing, and advanced analytics tools (e.g., CoPilot, OpenAI, Power BI, Databricks, AWS, Azure). Deep understanding of enterprise data governance, compliance, and security protocols. Exceptional leadership, communication, and collaboration skills, with a proven ability to influence stakeholders at all levels. Ability to translate complex data and AI concepts into strategic business opportunities, fostering innovation and competitive advantage. Strong knowledge of construction industry trends, with the ability to apply AI solutions to project management, supply chain logistics, and construction technologies. A forward-thinking, strategic mindset with a passion for leveraging cutting-edge technologies to drive business transformation. A proven history of leading large-scale, high-impact data and AI projects, positioning organizations for growth and operational efficiency. A commitment to fostering innovation while delivering measurable business results. Ability to navigate complex stakeholder environments, building trust and collaboration across technical and non-technical teams. Tutor Perini builds extraordinary projects, and we need exceptional talent. Join us, and together we will build the future. Salary range for this role is $175,000 to $240,000 per year. Equal Opportunity Employer

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