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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?

Amentum Salaries by Position

Amentum is seeking a Senior Software Engineer to join our USN advance technology development team working 30 hours a week. Someone to code, optimize and build software speed and efficiency in an R&D setting. We are fun, collaborative, supportive and our goal is to find great people who want to stay hands on in development yet have input in process improvements. We work hand in hand with the government customers on integrated teams. Primary work location will be in Fredericksburg, VA with occasional telecommute or travel opportunities. **Senior Software Engineer Responsibilities Includes:** + Develop and/or verify software system specifications and requirements documentation, develop support system software capabilities, features, or enhancements. + Plans, performs, and lead software design, coding, and testing. + Work with customers and engineers in an adaptive Agile environment, build and maintaining the latest development tools, helping expand our Modeling and Simulation capability. **Minimum Qualifications:** + Bachelors Degree (in Computer Science, Mechanical Engineering, Electrical Engineering, Computer Engineering, Electronics Engineering, Mathematics, or Physics) + Must be able to obtain/maintain a Secret security clearance (at a minimum, must receive/be approved for an interim Secret security clearance in order to start) Note: US Citizenship is required to obtain a SECRET Clearance. + 15 years of Software Development Experience, Software Design experience in DOD Weapons Systems and a current Secret clearance + Must Know the following programming languages: C/C++, Python, Assembly. **Preferred experience:** + Familiarity with as many as able of the following: RHEL, RTOS-E, Solaris or System-V based Unix, RHEL, FEDORA, or CentOS, some CI/CD Pipeline and Static Analysis tools such as Jenkins, Coverity, Cppcheck. Experience with and proficient with at least one of the following Object-oriented programming (OOP) languages: C/C++ or Java Amentum is proud to be an Equal Opportunity Employer. Our hiring practices provide equal opportunity for employment without regard to race, religion, color, sex, gender, national origin, age, United States military veterans status, ancestry, sexual orientation, gender identity, marital status, family structure, medical condition including genetic characteristics or information, veteran status, or mental or physical disability so long as the essential functions of the job can be performed with or without reasonable accommodation, or any other protected category under federal, state, or local law. Learn more about your rights under Federal EEO laws and supplemental language at EEO including Disability/Protected Veterans (https://www.dol.gov/agencies/ofccp/posters) and Labor Laws Posters (https://protect-us.mimecast.com/s/MI5TC2kqOqsOBPMVfnZ32U) .

Are you interested in using your skills to help shape the Cyber, Security, & Intel space? If so, look no further. We are seeking a Senior Software Engineer to join our team of passionate individuals. In this role you will support challenging, mission-critical projects that make a direct impact on the nations security and intelligence mission. As a Senior Software Engineer in Defensive Network Operations, you will support Windows Blue Team's Systems Vulnerability Analysts with the development of data collection and analysis tools. Responsibilities: Work closely with Blue Team operators to review and develop the requirements of the collection tools and then proceed with the development and implementation of the tools. You will be part of a larger development team supporting the Cyber Security Directorate's Defensive Network Operations organization. Requirements: Powershell Knowledge of Window's architecture Windows scripting/development Clearance Required: Active TS/SCI Poly Minimum Education: Bachelor's degree plus 8-years of relevant experience or Master's degree in plus 6-years of relevant experience. An Associate's degree plus 10-years of relevant experience or high school diploma/GED plus 12-years of relevant experience may be considered for individuals with in-depth experience that is clearly related to the position Computer Science (CS) degree or related field Preferred: Experience utilizing and development with Splunk Python Cyber Security Vulnerability Analysis javelin Pay Transparency Verbiage Amentums health and welfare benefits are designed to invest in you and in the things you care about. Your health. Your well-being. Your security. Your future. Eligible employees and their dependents may elect medical, dental, vision, and basic life insurance. Employees are able to enroll in our companys 401k plan, and, if eligible, a deferred compensation plan and Executive Deferral Plan. Employees will also receive 17 days of vacation per year, seven paid holidays, plus floating holidays and caregiver leave. Hired applicants will be able to purchase company stock and have the opportunity to receive a performance discretionary bonus. The base salary range for this position is $185 to 195K. This range reflects the minimum and maximum target for new hire salaries for the position across all US locations. Within the range, individual pay is determined by work location and additional factors, including job-related skills, experience, and relevant education or training.

Amentum is seeking a Mid Data Engineer (RDT&E) to support a DIA Analytic Innovations Office Advanced Analytics & Product Evaluation contract. This position is based in Washington, D.C. All employees will start in the Washington D.C office but upon request and with customer approval may be allowed to work from Reston VA, Quantico VA, or College Park MD. **Responsibilities** + Supports defense analytical requirements with enhanced scientific/engineering research, capability / limitation analysis, reverse engineering analysis/characterizations, facility and vulnerability assessments + Analysis and production includes, but is not limited to, complex foreign electronic systems, subsystems, facilities and/or equipment and can emphasize one or more area(s) pertaining to electric power, microelectronics, electronic hardware, circuits, sensors, guidance and control, signals, electromagnetic, electro-optical (EO)/infrared (IR) and/or similar areas associated with current and projected electronic systems and/or subsystems. This includes, but not limited to, electrical engineering and sub-disciplines of computer, electronic, optical, and power engineering + Design, implement, and operate data management systems for intelligence needs + Design data storage, access, use, integration, and management for different data regimes and digital systems + Work with data users to determine, create, and populate optimal data architectures, structures, and systems + Plan, design, and optimize data throughput and query performance + Participate in the selection of backend database technologies (e.g. SQL, NoSQL, Graph Database, etc.), their configuration and utilization, and the optimization of the full data pipeline infrastructure to support the actual content, volume, ETL, and periodicity of data to support the intended kinds of queries and analysis to match expected responsiveness **Requirements** + Must possess a current U.S. Government Top Secret security clearance with SCI eligibility (TS/SCI) + Must be able to obtain a polygraph + Bachelors degree required and 8 years of related experience in data analytics or engineering Amentum is proud to be an Equal Opportunity Employer. Our hiring practices provide equal opportunity for employment without regard to race, religion, color, sex, gender, national origin, age, United States military veterans status, ancestry, sexual orientation, gender identity, marital status, family structure, medical condition including genetic characteristics or information, veteran status, or mental or physical disability so long as the essential functions of the job can be performed with or without reasonable accommodation, or any other protected category under federal, state, or local law. Learn more about your rights under Federal EEO laws and supplemental language at EEO including Disability/Protected Veterans (https://www.dol.gov/agencies/ofccp/posters) and Labor Laws Posters (https://protect-us.mimecast.com/s/MI5TC2kqOqsOBPMVfnZ32U) .

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