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<p>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.</p>

<p>What factors could have biased this result, and what would you look into?</p>


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

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?

Statistics

<p>You are testing hundreds of hypotheses with many <em>t</em>-tests. What considerations should be made?</p>


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

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?

<p>The schema below is for a retail online shopping company consisting of two tables, <code>attribution</code> and <code>user_sessions</code>.</p>

<ul>
<li><p>The attribution table logs a session visit for each row.</p></li>

<li><p>If <code>conversion</code> is <code>true</code>, then the user converted to buying on that session.</p></li>

<li><p>The <code>channel</code> column represents which advertising platform the user was attributed to for that specific session.</p></li>

<li><p>Lastly the <code>user_sessions</code> table maps many to one session visits back to one user.</p></li>
</ul>

<p>First touch attribution is defined as the channel with which the converted user was associated when they first discovered the website.</p>

<p>Calculate the first touch attribution for each <code>user_id</code> that converted. </p>

<p><strong>Example:</strong></p>

<p><strong>Input:</strong></p>

<p><code>attribution</code> table</p>

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

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

<tr>
<td><code>channel</code></td>
<td>VARCHAR</td>
</tr>

<tr>
<td><code>conversion</code></td>
<td>BOOLEAN</td>
</tr>
</tbody>
</table>
<p><code>user_sessions</code> table</p>

<table>
<thead>
<tr>
<th>column</th>
<th>type</th>
</tr>
</thead>

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

<tr>
<td><code>created_at</code></td>
<td>DATETIME</td>
</tr>

<tr>
<td><code>user_id</code></td>
<td>INTEGER</td>
</tr>
</tbody>
</table>
<p><strong>Example output:</strong></p>

<table>
<thead>
<tr>
<th><code>user_id</code></th>
<th><code>channel</code></th>
</tr>
</thead>

<tbody>
<tr>
<td>123</td>
<td>facebook</td>
</tr>

<tr>
<td>145</td>
<td>google</td>
</tr>

<tr>
<td>153</td>
<td>facebook</td>
</tr>

<tr>
<td>172</td>
<td>organic</td>
</tr>

<tr>
<td>173</td>
<td>email</td>
</tr>
</tbody>
</table>


First Touch Attribution

<p>This is a W2 only role</p><p><br></p><p><strong>Software Engineer</strong></p><p><strong>Pay Rate/Range: $60.00 to $61.43 W2 only (no 1099 or C2C)</strong></p><p><strong>Hours: 8:00 a.m. to 5:00 p.m. </strong></p><p><strong>Location: Hybrid in Austin, TX - </strong>Onsite Mon/Wed/Thurs - No possibilities for fully remote</p><p><strong>Duration: 1 year with potential to extend </strong></p><p><br></p><p><strong>Key Areas of Responsibility</strong></p><ul><li>Collaborate with cross-functional teams to design, document, develop, and deploy software solutions supporting identity management and biometric applications.</li><li>Participate in the full software development lifecycle, including requirements gathering, solution architecture, coding, testing, deployment, and ongoing maintenance.</li><li>Write high-quality, efficient, and scalable code that adheres to industry best practices, coding standards, and project timelines.</li><li>Perform rigorous testing, debugging, and optimization of software applications to ensure robust performance, security, and reliability.</li><li>Stay current with emerging technologies, tools, and industry trends, proactively applying new knowledge to improve technical capabilities and enhance team performance.</li><li>Partner with product managers and stakeholders to analyze user needs, develop functional documentation, and translate requirements into precise technical specifications.</li><li>Participate in peer code reviews, offering constructive feedback to maintain code quality, consistency, and adherence to development standards.</li><li>Develop and maintain comprehensive technical documentation, including system specifications, user guides, and technical reports.</li><li>Serve as a Work Package Manager when assigned, taking accountability for scope definition, scheduling, and progress tracking of specific project components.</li><li>Work independently and collaboratively within a team of Software Engineers and Architects to deliver high-quality solutions.</li><li>Engage directly with customers during project implementation phases and provide advanced (Level 3) technical support for issue resolution.</li><li>Support sales and proposal efforts by contributing technical expertise to bid preparation and solution design.</li></ul><p><strong>Minimum Qualifications</strong></p><ul><li>Bachelor’s degree in Computer Science, Software Engineering, or a related field (or foreign equivalent), or equivalent work experience.</li><li>At least 5 years of experience in software engineering with a solid understanding of modern software development practices and processes.</li><li>Proven experience with programming experience using C#, .NET, and Java.</li><li>Proven experience with JavaScript development with expertise in Angular (versions 9–15).</li><li>Proficiency with modern version control systems such as Git or Mercurial (Hg).</li><li>Knowledge of software security principles, including application security and data protection during transmission and at rest.</li><li>Experience with data modeling and database querying using SQL Server and MySQL.</li><li>Familiarity with Agile and Waterfall software development methodologies.</li><li>Understanding of best practices for web API design, usability, and security.</li><li>Strong knowledge of server-side application architecture and development.</li><li>Ability to work independently and collaboratively as part of a team.</li><li>Effective verbal and written communication skills.</li><li>Strong analytical and problem-solving abilities, with a willingness to learn and adapt.</li><li>Practical, solution-focused approach to solving complex problems in a cost-effective manner.</li></ul><p><strong>Preferred Qualifications</strong></p><ul><li>Ability to digest complex situations, create appropriate strategies and simplify them for execution.</li><li>Knowledge of PKI and security best practices</li><li>Knowledge of cloud-based architectures and services (AWS, Azure)</li><li>Takes decisions in uncertain and ambiguous contexts.</li><li>Experience with project documentation (functional and technical requirements)</li><li>Experience with project tracking methods and tools for collaboration (Atlassian Jira, Confluence)</li><li></li><li>Benefits:</li><li> Health insurance</li><li> Health savings account</li><li> Dental insurance</li><li> Vision insurance</li><li> Flexible spending accounts</li><li> Life insurance</li><li> Retirement plan</li><li></li><li>All qualified applicants will receive consideration for employment without regard to age, race, color, religion, sex, sexual orientation, gender identity, national origin, disability, or status as a protected veteran.</li></ul><p></p>

Question	Topic	Difficulty	Ask Chance
Boarding Times Bias	Statistics	Medium	Very High
Hundreds of Hypotheses	Statistics	Medium	Very High
First Touch Attribution	SQL	Hard	Very High

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