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<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>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.</p>

<p>Write a query to randomly sample a row from this table.</p>

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

<p><code>big_table</code> table</p>

<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

<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?

Lightmatter Salaries by Position

<h3>Job Description</h3><div>Job Description<div><p><strong>Staff Software Engineer - ML Hardware Modeling </strong></p><p>Lightmatter builds chips that enable extreme-scale artificial intelligence computing clusters. If you're a collaborative engineer or scientist who has a passion for innovation, solving challenging technical problems, and doing impactful work like building the world's first optical computers, consider joining the team at Lightmatter!</p><p>We are looking for talented software engineers to help us build the next generation of AI processors and large-scale systems. Lightmatter’s unique technology has the potential to alter the architecture of large-scale computers. In this role, you will be responsible for simulations and analysis of design concepts and planned hardware at multiple levels of scale and detail that will play a key role in the hardware-software codesign of future systems.</p>Responsibilities<ul><li>Design, development, and maintenance of functional and performance models for design concepts and planned hardware, at both the subsystem and system levels</li><li>Participate in the co-design process by working closely with both hardware and software teams by providing initial pathfinding analysis, developing early analytical models, and more detailed event-based simulations, improving fidelity as designs progress</li><li>Collaborate with machine learning and compiler teams to construct and evaluate the performance of machine learning workloads</li><li>Contribute to successful execution for planned hardware by building detailed cycle approximate performance and functional models that help drive microarchitectural design and validation</li></ul><p><strong>Requirements</strong></p><ul><li>BS or higher in computer/software engineering, electrical engineering, or related field</li><li>8+ years of industry experience in hardware modeling, system simulation, computer architecture, or related fields</li><li>Proficient with C++ and Python</li></ul><p><strong>Preferred Qualifications</strong></p><ul><li>Familiarity with machine inference and training learning workloads</li><li>Experience with modeling and analysis of machine learning accelerator architectures and/or large-scale distributed systems</li><li>Proficient developing in a Linux-based environment</li></ul><p><strong>Benefits</strong></p><ul><li>Comprehensive Health Care Plan (Medical, Dental & Vision)</li><li>401k matching </li><li>Life Insurance (Basic, Voluntary & AD&D)</li><li>Generous Time Off (Vacation, Sick & Public Holidays)</li><li>Paid Family Leave </li><li>Short Term & Long Term Disability</li><li>Training & Development</li><li>Flexible, hybrid workplace model </li><li>Stock Option Plan</li></ul><p></p><p>We offer competitive compensation. The base salary range for this role, inclusive of all US locations, is $175,000-$205,000. Your base salary will be determined based on location, experience, educational background, and market data.<br /></p><p>Lightmatter recruits, employs, trains, compensates and promotes regardless of race, religion, color, national origin, sex, disability, age, veteran status, and other protected status as required by applicable law.</p></div></div>

Lightmatter Interview Questions

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Lightmatter Interview Questions

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