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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

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.

How would you assess the validity of the result?

Experiment Validity

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?

Draper Salaries by Position

Overview: Draper is an independent, nonprofit research and development company headquartered in Cambridge, MA. The 2,000+ employees of Draper tackle important national challenges with a promise of delivering successful and usable solutions. From military defense and space exploration to biomedical engineering, lives often depend on the solutions we provide. Our multidisciplinary teams of engineers and scientists work in a collaborative environment that inspires the cross-fertilization of ideas necessary for true innovation. For more information about Draper, visit www.draper.com. Job Description Summary: We are seeking a Senior Software Engineer (SMTS), experienced in C++ with a strong background in emulation environments, particularly QEMU, to assist in the development of advanced software analysis and testing tools. The ideal candidate will have experience in software fuzzing techniques and a deep understanding of modern software development processes, including CI/CD, version control, and agile methodologies. You will be responsible for designing, developing, and optimizing software solutions, with a focus on performance and security. Strong problem-solving skills and the ability to collaborate effectively with cross-functional teams are essential. This role requires a proactive mindset and the ability to adapt to evolving technologies. Job Description: Duties/Responsibilities •Independently execute task assignments. •Designs algorithms using modern theory and proven techniques, adheres to software best practices. •Analyzes designs to demonstrate performance and functionality. •Develops and executes software tests to check compliance with requirements. •Prepares technical data, procedures, reports, drawings, manuals, and other required documentation. •Communicates with customers and stakeholders to establish requirements and describe the design and deliverables. •Drives solutions to complex problems, actively participate in requirements development, propose ways forward, and adapt appropriately to changes in requirements. •Contributes to system architecture decisions and leads the architecture of sub-systems. •Provides insight and suggest adaptations or modifications to processes and/or applications based on quantitative data or results. •Identifies project technical risks and develops and executes mitigation strategies. •Actively mentors less experienced staff and provides thoughtful, constructive feedback. •Lead a small team of software developers on projects. Skills/Abilities •Curiosity-driven approach to solving complex, customer-driven problems as part of a multi-disciplinary team. •Demonstrate an ability to learn new programming languages and technologies quickly. •Collaborate and communicate effectively and openly with multi-disciplinary program team members, program leadership, and non-technical personnel. •A team player able to work in a fast-paced environment with the ability to balance multiple competing tasks and demands. Education Requires a bachelor's in Computer Science or other related field. Master's degree is preferred. Experience 5-10 years experience in Software Engineering or related field. Additional Job Description: Applicants will be required to obtain and maintain a government security clearance. Secret Clearance preferred. Connect With Draper for Future Opportunities! If you don't find the right posting in our Career Opportunities, you may submit your resume for future consideration. Job Location - City: Cambridge Job Location - State: Massachusetts Job Location - Postal Code: 02139-3563 Our work is very important to us, but so is our life outside of work. Draper supports many programs to improve work-life balance including workplace flexibility, employee clubs ranging from photography to yoga, health and finance workshops, off site social events and discounts to local museums and cultural activities. If this specific job opportunity and the chance to work at a nationally renowned R&D innovation company appeals to you, apply now www.draper.com/careers. Equal Employment Opportunity: Draper is committed to creating a diverse environment and is proud to be an affirmative action and equal opportunity employer. We understand the value of diversity and its impact on a high-performance culture. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, disability, age, sexual orientation, gender identity, national origin, veteran status, or genetic information. Draper is committed to providing access, equal opportunity and reasonable accommodation for individuals with disabilities in employment, its services, programs, and activities. To request reasonable accommodation, please contact hr@draper.com.

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