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<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>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 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.</p>

<p>How would you assess the validity of the result?</p>


Experiment Validity

Tencent Salaries by Position

<p>Responsibilities: Tencent Games was established in 2003. We are a leading global platform for game development, operations and publishing, and the largest online game community in China. Tencent Games has developed and operated over 140 games. We provide cross-platform interactive entertainment experience for more than 800 million users in over 200 countries and regions around the world. Honor of Kings, PUBG MOBILE, and League of Legends, are some of our most popular titles around the world. Meanwhile, we actively promote the development of esports industry, work with global partners to build an open, collaborative and symbiotic industrial ecology, and create high-quality digital life experiences for players. Level Infinite is Tencent's global gaming brand. It is a global game publisher offering a comprehensive network of services for games, development teams, and studios around the world. We are dedicated to delivering engaging and original gaming experiences to a worldwide audience, whenever and wherever they choose to play while building a community that fosters inclusivity, connection, and accessibility. Level Infinite also provides a wide range of services and resources to our network of developers and partner studios around the world to help them unlock the true potential of their games. As a Data Scientist Intern at Tencent Games, you will be responsible for: 1. Collecting, analyzing, and interpreting data to provide data-driven insights and solutions to business problems in the gaming industry, including various analysis and decision-making scenarios under R&D, marketing and operation stages. 2. Developing scalable, efficient, and automated processes for data analysis, AB test, machine-learning model, model validation and serving. 3. Collaborating with data product managers and data engineers to design and implement end-to-end data solutions in game development, publishing, and live-ops. 4. Researching new machine learning approaches, such as AIGC-related technologies, and exploring their potential applications in the gaming industry. Requirements: To be considered for this position, you should have: 1) Currently in Ph.D. program in a quantitative discipline, such as computer science, machine learning, or math/statistics. A strong publication record is preferred. 2) A passion for applying mathematical models and computer science technology to data-driven business decision-making, along with profound insights and understanding of the gaming industry. 3) Expertise in mathematical modeling, statistical analysis and machine learning, including probabilities, time series analysis, A/B testing, AIGC, etc. 4) Proficiency in programming languages such as Python, SQL, or related languages.</p>

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