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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

Suppose there exists a new airline named Jetco that flies domestically across North America. Jetco recently had a study commissioned that tested the boarding time of every airline, and it came out that Jetco had the fastest average boarding times of any airline.

What factors could have biased this result, and what would you look into?

What could potentially bias the average boarding time in favor of an airline that only flies domestically?

What could potentially bias the average boarding time in favor of an airline that only flies domestically?

Boarding Times Bias

A new airline came out as the fastest average boarding times compared to other airlines.  What factors could have biased this result and what would you look into?

Let’s say we have a table with an <code>id</code> and <code>name</code> fields. The table holds over 100 million rows and we want to sample a random row in the table without throttling the database.

Write a query to randomly sample a row from this table.

Input:

<code>big_table</code> table

<table>
<thead>
<tr>
<th>Columns</th>
<th>Type</th>
</tr>
</thead>

<tbody>
<tr>
<td><code>id</code></td>
<td>INTEGER</td>
</tr>

<tr>
<td><code>name</code></td>
<td>VARCHAR</td>
</tr>
</tbody>
</table>

Write a query to randomly sample a row from a big table.

Random SQL Sample

Idr, Inc. Salaries by Position

IDR is seeking a Cybersecurity Analyst to join one of our top clients in Irving, TX. If you are looking for an opportunity to join a large organization and work within an ever-growing team-oriented culture, please apply today! Position Overview for the Cybersecurity Analyst: The manager is looking to bring in a Cybersecurity Analyst that will work as part of the Cybersecurity Metrics and Reporting team in coordinating and overseeing American's cybersecurity metrics program. This individual will assist in the identification, measurement, and analysis of cybersecurity metrics, as well as support the continued metrics framework development and implementation. Required Skills for the Cybersecurity Analyst: <ul> <li>3+ years of experience identifying, analyzing, and reporting Cybersecurity Metrics </li><li>Prior experience working with various tools/technologies for collecting metric data </li><li>Strong experience with Cybersecurity risk assessment methodologies and tools </li><li>Strong experience with data analysis and visualization tools (Power BI) </li></ul> What's in it for you? <ul> <li>Competitive compensation package </li><li>Full Benefits; Medical, Vision, Dental, and more! </li><li>Opportunity to get in with an industry leading organization </li><li>Close-knit and team-oriented culture </li></ul> Why IDR? <ul> <li>25+ Years of Proven Industry Experience in 4 major markets </li><li>Employee Stock Ownership Program </li><li>Dedicated Engagement Manager who is committed to you and your success </li><li>Medical, Dental, Vision, and Life Insurance </li><li>ClearlyRated's Best of Staffing Client and Talent Award winner 10 years in a row</li> </ul>

IDR is seeking a SAP Business Analyst to join one of our top clients in Stuttgart, Arkansas. If you are looking for an opportunity to join a large organization and work within an ever-growing team-oriented culture, please apply today! Position Overview for the SAP Business Analyst:Our client is looking for a candidate to provide training and support for SAP MM and PP users, developing training materials and resolving system issues. You will create and execute test plans, ensuring the system meets business requirements. You'll analyze and improve business processes, maintaining documentation and enhancing system performance. You'll also manage SAP-related projects and ensure data integrity through regular audits and best practices. <ul><li>Required Skills for the SAP Business Analyst:5+ years of hands-on experience working with SAP Material Management (MM) and Production Planning (PP) modules. This includes a strong understanding of module functionalities, integration points, and navigation within SAP, as well as experience in optimizing these systems in a manufacturing or similar environment.</li><li>5+ years of experience developing training materials, conducting workshops, and serving as a point of contact for user inquiries, ensuring that users are proficient in the SAP MM and PP modules.</li><li>Strong project management skills, including the ability to lead and participate in SAP-related projects.</li><li>What’s in it for you?Competitive compensation package</li><li>Full Benefits; Medical, Vision, Dental, and more!</li><li>Opportunity to get in with an industry leading organization</li><li>Close-knit and team-oriented culture</li><li>Why IDR?25+ Years of Proven Industry Experience in 4 major markets</li><li>Employee Stock Ownership Program</li><li>Dedicated Engagement Manager who is committed to you and your success</li><li>Medical, Dental, Vision, and Life Insurance</li><li>ClearlyRated’s Best of Staffing® Client and Talent Award winner 10 years in a row</li></ul>

Senior BI Analyst Job Summary:We are looking for a skilled Senior BI Analyst to join our team on a 6-month contract, with the potential for extension. You will design, develop, and maintain business intelligence solutions using Tableau and other BI tools to support data-driven decision-making across the organization. Key Responsibilities:<ul><li>Develop and manage reports, analytics, and dashboards using Tableau to meet business needs.</li><li>Collaborate with stakeholders to understand requirements and translate them into technical specifications.</li><li>Conduct data analysis, ensure data accuracy, and provide actionable insights.</li><li>Mentor junior BI analysts and provide training on best practices.</li></ul> Qualifications:<ul><li>Bachelor’s degree in a relevant field; 5+ years of experience in BI or data analysis.</li><li>Strong proficiency in Tableau and experience with SQL, data manipulation, and ETL processes.</li><li>Proven analytical skills with the ability to present complex data to both technical and non-technical audiences.</li><li>Familiarity with large datasets, data environments, and other BI tools (e.g., Power BI, QlikView) is a plus.</li></ul> What’s in it for you?<ul><li>Competitive compensation package</li><li>Full Benefits; Medical, Vision, Dental, and more!</li><li>Opportunity to get in with an industry leading organization</li><li>Close-knit and team-oriented culture</li></ul> Why IDR?<ul><li>20+ Years of Proven Industry Experience in 4 major markets</li><li>Employee Stock Ownership Program</li><li>Dedicated Engagement Manager who is committed to you and your success</li><li>Medical, Dental, Vision, and Life Insurance</li><li>ClearlyRated’s Best of Staffing® Client and Talent Award winner 9 years in a row</li></ul>

Senior Data Engineer - Job Overview:We are seeking a Senior Data Engineer to design, develop, and maintain scalable data pipelines and systems using modern data architectures. This role involves building data pipelines with Snowflake, dbt, and Google Cloud Platform (GCP) while utilizing Python for data processing and automation. Key Responsibilities:<ul><li>Design, build, and maintain data pipelines and data warehouse models using Snowflake and dbt to support analytics and reporting.</li><li>Develop and manage data infrastructure on Google Cloud Platform (GCP) for optimal performance and cost efficiency.</li><li>Use Python for data processing, automation, and data pipeline orchestration, ensuring data quality and governance.</li></ul> Skills Required:<ul><li>5+ years of experience in data engineering with proficiency in Snowflake, dbt, and GCP services (BigQuery, Cloud Storage, Dataflow).</li><li>Strong expertise in Python for scripting and automation, along with SQL and data modeling skills.</li><li>Experience with data pipeline orchestration tools and best practices for data security, privacy, and compliance.</li></ul> What’s in it for you?<ul><li>Competitive compensation package</li><li>Full Benefits; Medical, Vision, Dental, and more!</li><li>Opportunity to get in with an industry-leading organization.</li><li>Close-knit and team-oriented culture</li></ul> Why IDR?<ul><li>20+ Years of Proven Industry Experience in 4 major markets</li><li>Employee Stock Ownership Program</li><li>Dedicated Engagement Manager who is committed to you and your success.</li><li>Medical, Dental, Vision, and Life Insurance</li><li>ClearlyRated’s Best of Staffing® Client and Talent Award winner 11 years in a row</li></ul>

Job Summary:We are looking for an experienced Nearshore Self-Service Data Engineer with expertise in Snowflake and DBT (data build tool) to join our dynamic data team. You will be responsible for designing, building, and optimizing data pipelines to transform raw data into valuable insights for decision-making. Key Responsibilities:<ul><li>Develop and maintain data pipelines and ETL processes using Snowflake, dbt, and other tools.</li><li>Collaborate with stakeholders to understand data requirements and deliver scalable data solutions.</li><li>Build and optimize data models, ensuring data accuracy and performance.</li><li>Implement data governance, security, and privacy best practices in Snowflake.</li></ul> Qualifications:<ul><li>Bachelor’s degree in a relevant field; 3+ years of experience in data engineering or ETL development.</li><li>Strong experience with Snowflake and dbt for data transformation and modeling.</li><li>Experience with cloud platforms (AWS, Azure, or GCP) and data warehousing concepts.</li><li>Excellent problem-solving and communication skills, with the ability to work collaboratively.</li></ul> What’s in it for you?<ul><li>Competitive compensation package</li><li>Full Benefits; Medical, Vision, Dental, and more!</li><li>Opportunity to get in with an industry-leading organization.</li><li>Close-knit and team-oriented culture</li></ul> Why IDR?<ul><li>20+ Years of Proven Industry Experience in 4 major markets</li><li>Employee Stock Ownership Program</li><li>Dedicated Engagement Manager who is committed to you and your success.</li><li>Medical, Dental, Vision, and Life Insurance</li><li>ClearlyRated’s Best of Staffing® Client and Talent Award winner 11 years in a row</li></ul>

IDR is seeking a GCP Data Engineer to join one of our top clients onsite in Dallas on a long term contract opportunity! Position Overview/Responsibilities for the GCP Data Engineer:We are seeking a skilled GCP Engineer to join our data engineering team. The ideal candidate will be responsible for designing, building, and maintaining scalable data pipelines and architectures on Google Cloud Platform (GCP). You will work closely with data scientists, analysts, and other stakeholders to ensure efficient data flow and integration across various GCP services. Required Skills for the GCP Data Engineer:<ul><li>7+ years of hands-on GCP/BQ/Dataflow experience</li><li>7+ years of SQL skills</li><li>5+ years of shell and Python scripting</li><li>Excellent communication skills</li><li>Ability to effectively communicate with the business, gather requirements</li></ul> What’s in it for you?<ul><li>Competitive compensation package</li><li>Full Benefits; Medical, Vision, Dental, and more!</li><li>Opportunity to get in with an industry leading organization</li><li>Close-knit and team-oriented culture</li></ul> Why IDR?<ul><li>20+ Years of Proven Industry Experience in 4 major markets</li><li>Employee Stock Ownership Program</li><li>Dedicated Engagement Manager who is committed to you and your success</li><li>Medical, Dental, Vision, and Life Insurance</li><li>ClearlyRated’s Best of Staffing® Client and Talent Award winner 10 years in a row</li></ul>

IDR is seeking a Cybersecurity Analyst to join one of our top clients in Irving, TX. If you are looking for an opportunity to join a large organization and work within an ever-growing team-oriented culture, please apply today! Position Overview for the Cybersecurity Analyst:The manager is looking to bring in a Cybersecurity Analyst that will work as part of the Cybersecurity Metrics and Reporting team in coordinating and overseeing American’s cybersecurity metrics program. This individual will assist in the identification, measurement, and analysis of cybersecurity metrics, as well as support the continued metrics framework development and implementation. Required Skills for the Cybersecurity Analyst:<ul><li>3+ years of experience identifying, analyzing, and reporting Cybersecurity Metrics</li><li>Prior experience working with various tools/technologies for collecting metric data</li><li>Strong experience with Cybersecurity risk assessment methodologies and tools</li><li>Strong experience with data analysis and visualization tools (Power BI)</li></ul> What’s in it for you?<ul><li>Competitive compensation package</li><li>Full Benefits; Medical, Vision, Dental, and more!</li><li>Opportunity to get in with an industry leading organization</li><li>Close-knit and team-oriented culture</li></ul>Why IDR?<ul><li>25+ Years of Proven Industry Experience in 4 major markets</li><li>Employee Stock Ownership Program</li><li>Dedicated Engagement Manager who is committed to you and your success</li><li>Medical, Dental, Vision, and Life Insurance</li><li>ClearlyRated’s Best of Staffing® Client and Talent Award winner 10 years in a row</li></ul>

IDR is seeking a Salesforce Product Manager to join one of our top clients in Phoenix, AZ. If you are looking for an opportunity to join a large organization and work within an ever-growing team-oriented culture, please apply today! Applicants must be local to the Phoenix, AZ area at this time. Position Overview: <ul> <li>Lead the product lifecycle from conception through launch, ensuring alignment with business goals and customer needs </li><li>Utilize your deep understanding of Salesforce Sales Cloud to guide product development and ensure that our solutions leverage the platforms full potential </li><li>Work closely with QA teams to ensure that the product is thoroughly tested in lower Salesforce environments before release </li><li>Develop and deliver training sessions to ensure that end-users are proficient in using new product features </li></ul> Required Skills: <ul> <li>Proven experience in product management, with a focus on Salesforce Sales Cloud </li><li>Ability to break down complex requirements into actionable user stories </li><li>Experience working with QA teams and supporting testing processes </li><li>Experience working with QA teams and supporting testing processes </li></ul> What’s in it for you? <ul> <li>Competitive compensation package </li> <li>Full Benefits; Medical, Vision, Dental, and more! </li> <li>Opportunity to get in with an industry leading organization </li> <li>Close-knit and team-oriented culture </li> </ul> Why IDR? <ul> <li>25+ Years of Proven Industry Experience in 4 major markets </li> <li>Employee Stock Ownership Program </li> <li>Dedicated Engagement Manager who is committed to you and your success </li> <li>Medical, Dental, Vision, and Life Insurance </li> <li>ClearlyRated’s Best of Staffing® Client and Talent Award winner 11 years in a row </li> </ul> Compensation Details: $66 - $72/hr

IDR is seeking a Sr. Software Engineer to join one of our top clients in Phoenix, Arizona. If you are looking for an opportunity to join a large organization and work within an ever-growing team-oriented culture, please apply today! Position Overview for the Sr. Software Engineer:We are looking for a Senior Software Engineer to join this global leader! The Developer will join our clients' Customer Hub Application Team within their IT division. This specific team manages a data platform that provides crucial purchase data to various entities within the corporation and indirectly to customers so that critical decisions can be made! Required Skills for the Sr. Software Engineer:<ul><li>5+ years of hands-on experience working on development projects in JavaScript (Node JS, Typescript, Mongo DB, Apollo GraphQL)</li><li>5+ years of experience with Angular front-end development</li><li>5+ years of experience with Azure Kubernetes Service (AKS)</li><li>3+ years of hands-on experience with NestJS/Prisma</li></ul>What’s in it for you?<ul><li>Competitive compensation package</li><li>Full Benefits; Medical, Vision, Dental, and more!</li><li>Opportunity to get in with an industry leading organization</li><li>Close-knit and team-oriented culture</li></ul>Why IDR?<ul><li>25+ Years of Proven Industry Experience in 4 major markets</li><li>Employee Stock Ownership Program</li><li>Dedicated Engagement Manager who is committed to you and your success</li><li>Medical, Dental, Vision, and Life Insurance</li><li>ClearlyRated’s Best of Staffing® Client and Talent Award winner 10 years in a row</li></ul>

IDR is seeking a Software Engineer II to join one of our top clients in Colorado Springs, Colorado. If you are looking for an opportunity to join a large organization and work within an ever-growing team-oriented culture, please apply today! *NOT OPEN TO C2C* Position Overview for the Software Engineer II:<ul><li>Design, develop, and maintain mission-critical software for a missile defense system, utilizing programming languages like Java and C++ to create and modify complex engineering applications. Ensure the software meets high-performance standards and adheres to user requirements.</li><li>Analyze and review existing code within Cameo modeling tools to ensure proper code exposure and functionality. Migrate to more current Java versions and containerize applications for enhanced efficiency and scalability.</li><li>Identify and resolve software defects through detailed debugging processes. Implement modifications to improve software performance and compatibility across various operating environments and systems.</li><li>Collaborate with cross-functional teams to integrate software into new or modified systems. Provide recommendations to improve software documentation and development processes, ensuring compliance with industry standards and project constraints.</li></ul> Required Skills for the Software Engineer II:<ul><li>3-5 years of experience with strong knowledge of Java and C++ programming. Expertise in software modeling, Jira, Confluence, and cloud-based software development environments. Proven ability to support infrastructure, platform, and application systems.</li><li>Experience addressing complex issues related to systems integration and cloud compatibility. Skilled in using agile software development processes and understanding user requirements to deliver effective solutions.</li><li>Must hold an active Secret Security Clearance, with Top Secret preferred. U.S. Citizenship is required due to security clearance requirements and federal contracts.</li><li>Bachelor’s degree in a relevant field, with clear verbal and written communication abilities. Strong organizational and planning skills, proactive in driving projects to completion, and diligent in coordinating with team members.</li></ul> What’s in it for you?<ul><li>Competitive compensation package</li><li>Full Benefits; Medical, Vision, Dental, and more!</li><li>Opportunity to get in with an industry leading organization</li><li>Close-knit and team-oriented culture</li></ul> Why IDR?<ul><li>25+ Years of Proven Industry Experience in 4 major markets</li><li>Employee Stock Ownership Program</li><li>Dedicated Engagement Manager who is committed to you and your success</li><li>Medical, Dental, Vision, and Life Insurance</li><li>ClearlyRated’s Best of Staffing® Client and Talent Award winner 11 years in a row</li></ul> Compensation Details: $130,000/year to $150,000/year W2. NOT OPEN TO C2C.

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