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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

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?

Umbra Salaries by Position

<h3>Job Description</h3><div>Job Description<div>Salary: $125,793 - $171,277 DOE Our mission: Deliver global omniscience. To stay ahead of climate change, geopolitical risk, and other major crises and issues, we need a global understanding of what is changing, where, and how fast. Umbra provides easy access to the highest quality commercial satellite data available, which is an indispensable tool for the growing number of organizations monitoring the Earth. We empower our customers to create solutions that inform, inspire, and address our planet’s most pressing needs. We’re helping to create a brand new industry that has never meaningfully existed before. We are seeking an Engineering Manager (Space Hardware) to join the Space Systems Department to provide personnel and programmatic leadership alongside a technically focused staff of Directors. This individual will report directly to the Vice President, and oversee the management of personnel that design, build, test and operate cutting-edge satellite technology. As an Engineering  Manager in the Space Systems Department at Umbra, you will have an opportunity to work with both hardware, software and product focused teams as well as the senior staff, to substantially impact the development of new technology and the personal growth of an extremely talented group of engineers. This position is located in our Santa Barbara office in order to collocate with the Space Hardware team. Key Responsibilities<ul><li>Manage the personnel and guide programmatic efforts within the Space Hardware team as part of the Space Systems Department</li><li>Guide the professional development and career planning of Space Hardware engineers, taking into account inputs from technical leadership</li><li>Collaborate directly with project, product and technical leads to understand scope of work in order to ensure individuals are executing with high quality and velocity</li><li>Manage individuals in aspects such as but not limited to workload, assignment, support, development and conflict resolution </li><li>Conduct regular one on one meetings with your team as well as performance reviews</li><li>Ensure your team's compliance with legal regulations, security standards, and company policies</li><li>Represent your team needs and capacity in technical meetings and collaborate with architects to form well informed solutions</li><li>Identify opportunities for process improvements and implement changes to enhance efficiency and effectiveness</li><li>Interface directly with the VP, Space Systems to coordinate and report on efforts across the Department</li><li>Collaborate with various stakeholders on headcount planning and hiring</li><li>Utilize agile practices to support sprint planning, track progress and manage and report individual performance</li><li>Other professional duties as assigned <ul></ul></li></ul><ul></ul><ul></ul><ul></ul><ul></ul> Basic Qualifications<ul><li>5+ years of experience in personnel management</li><li>3+ years of experience in project management</li><li>3+ years of experience and/or direct exposure to hardware engineering  </li><li>Experience with traditional project management practices and tools, such as critical path analysis, resource loading and MS Project</li><li>Experience with agile project management practices and tools, such as scrum, SAFe and Jira </li><li>Demonstrated ability to develop and support a team of engineers</li><li>Excellent communication, organization and interpersonal skills </li><li>Ability to work effectively in a fast-paced, collaborative, and dynamic environment</li></ul> Desired Qualifications<ul><li>10+ years of experience in personnel management</li><li>5+ years of experience in project management</li><li>5+ years of experience and/or direct exposure to hardware engineering </li><li>Demonstrated expertise in applying Jira to hardware engineering</li><li>Degree in engineering or a related STEM field</li><li>Certifications in PMP (Project Management Professional), CAPM (Certified Associate in Project Management), and/or CSM (Certified Scrum Master)</li></ul> Benefits<ul><li>Flexible Time Off, Sick, Family & Medical Leave</li><li>Medical, Dental, Vision, Life, LTD, STD (employer funded)</li><li>Vol Life, Critical Illness, Accidental, Hospital Indemnity, Pet Insurance (employee funded)</li><li>401k with 3% non-elective company contribution</li><li>Stock Options </li></ul> Umbra is an Equal Opportunity Employer that is committed to inclusion and diversity. We take affirmative action to ensure equal opportunity for all applicants without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, disability, Veteran status, or other legally protected characteristics. Employment Eligibility VerificationIn compliance with federal laws, all hired persons will be required to verify their identity and eligibility to work in the United States by completing the required Employment Eligibility Verification Form (I-9 Form) upon hire. ITAR/EAR RequirementsThis position may include access to technology and/or data that is subject to U.S. export controls pursuant to ITAR and EAR. To comply with federal export controls, all persons hired must be a U.S. citizen, U.S. national, U.S. lawful permanent resident, refugee or asylee as defined by 8 U.S.C. § 1324b(a)(3), or must otherwise be eligible to obtain the required authorizations from the U.S. Department of State and/or U.S.Department of Commerce as applicable. Pay Transparency This job posting may span more than one career level. To provide greater transparency to candidates, we share base ranges for all job postings regardless of state. We set standard base pay ranges for all roles based on function and level benchmarked against similar stage growth companies. Final offer amounts are determined by skills, responsibilities and relevant work experience.</div></div>

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