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<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.

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?

Tsmc Salaries by Position

<p>At TSMC Arizona, brilliance can ignite a world of innovation and launch a promising future. The world’s most brilliant innovators entrust us to transform their ideas into world-changing products that impact millions of lives. As long as you have the same passion to pursue excellence, you will find your fit here.

TSMC Arizona is looking for a Dry Etch Equipment Engineer Manager to join our 5-nanometer fab, located in sunny Phoenix, Arizona. As a Dry Etch Equipment Engineer Manager, you will demonstrate a strong sense of reliability and enthusiasm and will possess an attitude that embodies our core values – Integrity, Commitment, Innovation and Customer Trust.

At TSMC Arizona’s Dry Etch department you’ll be responsible for new technology process transfer and matching to ensure successful Fab ramp to high volume manufacturing (HVM). Responsible for new tool installation / qualification / sustain in a green field Fab and rapidly deploy fleet to meet wafer output commitment.

Job Description

Your main responsibilities include:

Work with mother Fab ETC team to fingerprint all ETC tools to ensure seamless technology transfers.
New production line set up and maintenance.
Equipment troubleshooting.
Resource planning, task prioritization, and related cross-function management work to move-in, install and qualify tools.
Manage teams and work cross-functions to sustain ETC lines for tools.
Manage teams and work cross-functions to continue improve the issues on ETC lines.
Create and encourage a learning/sharing environment within your team and cross-function to develop talent.

Minimum Qualifications

Applicants must be legally eligible to work in the United States and have:

B.S. (~10+ years exp.), Masters (~5-10+ years exp.) or Ph.D. (~3+ years exp.) in an Engineering or Physics-related field.
Advanced operations and program management experience.
Experience in silicon semiconductor manufacturing with exposure to and understanding of 22nm technology or below.
RD or HVM experience in single wafer etching at 300mm semiconductor fabs (experience on AMAT/Hitachi/TEL/LAM tools is preferred).
Previous experience in IDM (logic or memory) is preferred.
Strong verbal and written communication skills in English.
Demonstrated experience working with external and internal partners, including leading edge semiconductor equipment and/or materials manufacturers.
A fast learner, able to adapt to culture and technology.
Hands-on equipment experience with a strong sense of ownership.
Willing to work in a clean room environment.
All Equipment Engineers (EE) may be required to work a Compressed Work Week (4-day on, 3-day off, 3-day on, 4-day off), and may be required to work night shift on a rotational basis.
Night shift rotations are expected to be no more than 4 months per calendar year.

Personal Attributes

Must be a self-starter, highly organized, and have an ability to work independently across organizations.
Demonstrated ability to communication complex problems through presentations and use of interpersonal persuasive skills.
Must possess top-level business management, interpersonal, and facilitation skills.
Desire for and demonstrated skill in leading and developing of persons and teams.

Work Location : Phoenix, AZ

Travel : NA

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