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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?

Dcs Corp Salaries by Position

This is an opportunity to join a fast-paced program with DCS Corp's U.S. Army Combat Capabilities Development Command - Ground Vehicle Systems Center engineering group located in Warren, MI. As an experienced Software Engineer, you will work alongside our U.S. Army Software Engineering Center customer, applying your knowledge and skills by providing technical engineering services that support the development of software requirements, architecture, design, code and test for the JLTV Program.
Essential Job Functions:
Software Development following organizational standard software processes.
Experience in handling requirement specs and developing and implementing the functions per requirement.
Understanding of SysML, sequence diagrams, activity diagrams.
Working well with others to learn and resolve technical obstacles (problems).
Design software following defined architectures.
Implement and unit test software.
Required Skills: 
Due to the sensitivity of customer related requirements, U.S. Citizenship is required. 
Must be able to obtain and maintain a DoD Secret clearance.
Bachelor's degree in engineering with 5 years of experience. 
Technical expertise with C, C++ development and building complex systems.
Knowledge using RTOS. (Real Time Operating System such as Vx Works).
Work well with others to learn and resolve technical problems.
Interfacing with cross functional teams and effective communication.
Experience and working in cloud environment, Bitbucket , Atlassian tools, JIRA, Confluence and standard software development and release process.
Experience in Agile development environment using opensource tools.
Ability to troubleshoot and debug issues.
Vehicle communication protocols CAN, LIN and experience in defining or using CAN DB (CAN Database files).
Understanding of Vehicle bus architecture (BCM ( Body Controls) and ECM (Engine Control Module)) using CAN tools ( Vector tools or CAN COTS).
Technical Skills:
C, C++, JavaScript.
RTOS - Vx Works.
Protocols: CAN, Cloud Environment: MS Azure.
Tools: BitBucket, Jira, Confluence, Vector CANoe, CANalyzer).
Build knowledge using Make.
Git command / repository knowledge.

DCS Corporation has an immediate opening for a Mission Data (MD) Engineer supporting the US Reprogramming Lab (USRL) and 513th Electronic Warfare Squadron (EWS) at Eglin AFB, Florida. The mission of the USRL is to develop, test & produce combat credible Mission Data (MD) for the F-35 Joint Strike Fighter of the DOD: Air Force, Navy, Marine Corps. Our team at the USRL produces MD to defeat enemy threat systems in the Electro-Magnetic (EM) spectrum and enhance F-35 survivability in combat. Essential Job Functions: The MD Engineer will work with other members of the USRL team to develop state-of-the-art MD for the advanced 5th generation F-35 JSF. The ideal candidates responsibilities will include: MD development, MD Validation & Verification (V&V), Operational MD Assessment/Development/Testing. Conduct Intelligence research & analysis to develop and program complex MD files for the F-35 Electronic Warfare (EW) suite and enhance situational awareness for F-35 pilots. Design / develop complex EW models, programs, and automation tools to increase efficiency of MD Lab testing and analysis. Advise on RF components, characteristics, and antenna performance parameters to optimize MD programming efforts. Communicate detailed feedback (orally & written) from V&V analysis to support MD production and configuration management. Job Requirements: Due to the sensitivity of customer related requirements, U.S. Citizenship is required. Bachelor Degree in an Engineering / STEM discipline with eight (8) years of relevant experience. Electrical Engineering degree is preferred. Must be able to obtain a Secret security clearance and maintain throughout employment, Active Secret clearance highly desirable. Occasional travel 2-3 weeks / year. Desired Skills: Experience programming MD for 4th / 5th generation fighter aircraft. Experience with software applications to program and produce MD. Experience with V&V test plans and directing MD testing in a Lab setting. Proficient working knowledge of: CED, EWIRDB, NGES, SPECTRE & MATLAB. Proficient working knowledge of EW fundamentals & threat radar systems / parametrics. Familiarity with F-35 avionics & AESA generation radars.

Dcs Corp Interview Questions

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Dcs Corp Interview Questions

Dcs Corp Salaries by Position

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