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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.

Write a query to randomly sample a row from this table.

Input:

<code>big_table</code> table

<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

You are testing hundreds of hypotheses with many t-tests. What considerations should be made?

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

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?

Let’s say you work for a social media company that has just done a launch in a new city. Looking at weekly metrics, you see a slow decrease in the average number of comments per user from January to March in this city.

The company has been consistently growing new users in the city from January to March.

What are some reasons why the average number of comments per user would be decreasing and what metrics would you look into?

What metric could be used to measure if active users are still engaging on the platform despite an overall decrease in the average number of comments per user?

What metric could be used to measure if active users are still engaging on the platform despite an overall decrease in the average number of comments per user?

Decreasing Comments

How would you investigate a decline in the average number of comments per user?

Tractor Supply Company Salaries by Position

Overall Job Summary The Sr. Data Scientist role will require the necessary skill sets in statistical modeling and advanced analytics techniques to generate models for the Finance department to further our understanding of Tractor Supply's operational and financial performance. This role will own the translation of predictive modeling results to actionable insights that can be utilized across the TSC organization. In addition, this position will aid the broader Finance Team with data analysis requests as needed by the business. Essential Duties and Responsibilities (Min 5%) <ul> <li>Provide analytical support to various department leadership teams to be used in key business decisions.</li> <li>Design, perform, report, and present insightful scientific analyses that address financial, operational and accounting implications, as well as pinpoint key drivers and identify short- and long-term action steps that focus on current and future business implications. </li> <li>Provide analytical support to senior business leaders and all departments. </li> <li>Support the long-range planning, strategic planning, and budgeting processes across all functions. </li> <li>Manage multiple projects simultaneously including development of new technologies and maintenance of existing framework.</li> <li>Conduct, perform, report, and present special financial and statistical studies in coordination with other departments.</li> <li>Maintain a broad exposure to the wider ecosystem of AI / Machine Learning and ensure our team is pushing toward the most optimal solutions.</li></ul> Required Qualifications Experience: 5+ years of related business or retail experience. Education: Bachelor's degree is required. Master of Business Administration (MBA), Mathematics, or related advanced degree is desired. Any suitable combination of education and experience will be considered. Professional Certifcations: None Preferred knowledge, skills or abilities <ul> <li>Strong communication, leadership, analystical, and team building skills.</li> <li>Ability to make decisions without immediate supervision.</li> <li>Proficiency using Microsoft Office, Snowflake, SQL, ETL, and Python required</li> <li>Experience using Azure, AWS, or another cloud compute platform a plus.</li> <li>Ability to frame business questions and create an analytics solution using statistical or other advanced analytics methodologies.</li> <li>Proven advanced modeling experience in leading data-driven projects from definition to execution, driving and influencing project roadmaps.</li> <li>Familiarity with visualization tools such as Power BI and Tableau.</li> <li>Experience with advanced statistical analysis, data science, and machine learning preferred.</li></ul> Working Conditions <ul><li>Hybrid / Flexible working conditions</li></ul> Physical Requirements <ul><li>Sitting</li><li>Standing (not walking)</li><li>Walking</li><li>Lifting up to 10 pounds</li></ul> Disclaimer This job description represents an overview of the responsibilities for the above referenced position. It is not intended to represent a comprehensive list of responsibilities. A team member should perform all duties as assigned by his/ her supervisor. ALREADY A TEAM MEMBER? You must apply or refer a friend through our internal portal Click here CONNECTION Our Mission and Values are more than just words on the wall - they're the one constant in an ever-changing environment and the bedrock on which we build our culture. They're the core of who we are and the foundation of every decision we make. It's not just what we do that sets us apart, but how we do it. Learn More EMPOWERMENT We believe in managing your time for business and personal success, which is why we empower our Team Members to lead balanced lives through our benefits total rewards offerings. fot full-time and eligible part-time TSC and Petsense Team Members. We care about what you care about! Learn More OPPORTUNITY A lot of care goes into providing legendary service at Tractor Supply Company, which is why our Team Members are our top priority. Want a career with a clear path for growth? Your Opportunity is Out Here at Tractor Supply and Petsense. Learn More Join Our Talent Community

Tractor Supply Company Interview Questions

Tractor Supply Company Interview Guides

Tractor Supply Company Interview Questions

Tractor Supply Company Salaries by Position

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