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A/B Testing

Algorithms

Analytics

Machine Learning

Probability

Product Metrics

Python

Statistics

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<p>Let’s say you work on the growth team at Facebook and are tasked with promoting Instagram from within the Facebook app.</p>

<p>Where and how could you promote Instagram through Facebook?</p>


<p>You're promoting Instagram within the Facebook app. Which of the following methods involves leveraging network effects?</p>

You're promoting Instagram within the Facebook app. Which of the following methods involves leveraging network effects?

Promoting Instagram I

<p>To promote Instagram on Facebook, you consider allowing Instagram users to post pictures to Facebook. How could you measure the success of this feature?</p>

To promote Instagram on Facebook, you consider allowing Instagram users to post pictures to Facebook. How could you measure the success of this feature?

Promoting Instagram II

<p>In a strategy to promote Instagram from within Facebook, what concept might you employ to improve the value of the service?</p>

In a strategy to promote Instagram from within Facebook, what concept might you employ to improve the value of the service?

Promoting Instagram III

Promoting Instagram

<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

<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.

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