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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

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Job Overview: Lexia is seeking a Salesforce Business Analyst to join our Business Systems team! The ideal candidate has exceptional communication skills to effectively translate conceptual requirements into actionable solutions. Collaborating closely with our business and Salesforce technical teams, this personal will play a key role in gathering requirements, project planning, and ensuring seamless execution. Exceptional analytical and problem-solving capabilities are essential. Additionally, the ideal applicant will be passionate about developing institutional knowledge to become an asset to the organization. Location: Remote, USA. The ideal candidate will be able to work east coast hours. Job Responsibilities: Role Objectives <ul> <li>Work with business stakeholders to elicit and document user requirements </li><li>Communicate technical solutions to business stakeholders in a simple and effective manner, including providing and maintaining diagrammed business processes </li><li>Create and deliver appropriate project deliverables including, but not limited to, business requirements documents, technical and process diagrams, wireframes, project workbooks, and testing documentation. </li><li>Proactively identify areas for process improvement and efficiency </li></ul>Essential Functions <ul> <li>Thoroughly document requirements, specifications, deliverables, and project status </li><li>Under the Product Owner's guidance, contribute ideas for building both short- and long-term roadmaps for enhancements and fixes </li><li>Scope solutions in partnership with Salesforce Administrators and Developers </li><li>Provide solution recommendations to both the business and technical team </li><li>Facilitate communication and collaboration between stakeholders and technical team </li><li>Develop acceptance criteria and document and execute test cases. </li></ul>Job Requirements: <ul> <li>5+ years experience serving in a business analyst capacity </li><li>Skilled in Salesforce.com, including knowledge/comfortability conversing in architecture and administrative functions </li><li>Ability to prioritize and manage multiple tasks in a fast-paced environment </li><li>Excellent interpersonal skills, with the ability to collaborate effectively with stakeholders at all levels </li><li>Excellent communication skills, both verbal and written, with the ability to convey complex information clearly and concisely. </li><li>Highly analytical with the ability to gather and interpret business requirements </li><li>Continuous learning mindset </li></ul> To learn more about our organization and the exciting work we do, visit https://www.lexialearning.com/ An Equal Opportunity Employer We are dedicated to fostering a culture that celebrates unique backgrounds, ideas, and experiences. All qualified applicants will receive consideration for employment without discrimination on the basis of race, color, age, religion, sex, gender, gender identity/expression, sexual orientation, national origin, protected veteran status, or disability.

Job Overview: Learning A-Z provides engaging, affordable, and easy-to-use solutions for differentiated K-6 literacy learning. With a library of meticulously differentiated eLearning tools that can be used anywhere learning takes place, we give educators the tools they need to easily personalize instruction for each student, and help each teacher make an impact - their way. In this role, you will be involved in the technical development of multiple applications. You will be a part of a dynamic group of engineers where agility, synergy, and creative thinking are highly valued. You will utilize your expertise in PHP, MySQL, HTML, CSS, and Angular to create and support best-in-class web experiences that meet business targets and exceed user expectations. The ideal candidate will demonstrate skills with both business and technical acumen. Job Responsibilities: <ul><li>Solve problems of considerable scope and complexity.</li><li>Collaborate with software engineers, QA engineers, UX and Design team, and project managers.</li><li>Propose, develop, review, and revise new procedures as needed for the continuing development of high-quality systems.</li><li>Maintain high test coverage across unit, functional and integration test suites. Ensure code quality by participating in code and design reviews.</li><li>Troubleshoot existing systems and applications.</li><li>Keep informed of technical advances. You can propose changes based on newer technology or ideas relating to other coding patterns, efficiencies.</li><li>Remain flexible and responsive to changing priorities and multiple, concurrent responsibilities.</li><li>Provide technical guidance and training to other team members.</li></ul> Job Requirements: <ul><li>6+ years of Software Engineering experience</li><li>High level proficiency in programming languages/frameworks: Laravel, PHP, MySQL (SQL)</li><li>Proficient in front-end frameworks like Angular, AngularJS</li><li>Proficient in web development technologies: Javascript, HTML, CSS</li><li>Experience with a distributed source control system, such as Git</li><li>Knowledge of software engineering fundamentals, including: Object-Oriented analysis, Design, Programming, Software Design patterns, Data Structures, and Algorithms.</li><li>Able to work autonomously and within a team environment</li><li>Able to express ideas effectively by evaluating and consolidating relevant information for different audiences</li><li>Experience using problem solving and data-based skills to solve business problems and drive process improvements.</li><li>Experience working with other members of an engineering team in design, development, implementation, peer code reviews, and technical meetings</li></ul> Why Work With Us? When you work with Learning A-Z, you'll be helping students across the globe develop the comprehension, curiosity, and continued joy of learning they need to succeed in today's world. We've been awarded numerous accolades from a wide variety of edtech organizations. Our flagship products Reading A-Z, Raz-Kids, and Raz-Plus are beloved by teachers and students alike, and are currently used by approximately 1/5 of public students in the United States. To learn more about our organization and the exciting work we do, visit www.learninga-z.com. An Equal Opportunity Employer We are dedicated to fostering a culture that celebrates unique backgrounds, ideas, and experiences. All qualified applicants will receive consideration for employment without discrimination on the basis of race, color, age, religion, sex, gender, gender identity/expression, sexual orientation, national origin, protected veteran status, or disability.

Cambium Learning Group Interview Questions

Cambium Learning Group Interview Guides

Cambium Learning Group Interview Questions

Cambium Learning Group Salaries by Position

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