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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 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

Dcs Corp Salaries by Position

DCS is a premier professional services firm providing engineering, programmatic and technical support services to the Department of Defense and other customers focused on national security. As part of our commitment to innovation and data-driven decision-making, we are seeking a talented Power BI Developer & Data Analyst to join our team.
As a Power BI Developer & Data Analyst, you will play a key role in transforming raw data into actionable insights, providing critical support for decision-making across various departments within the company. You will be responsible for developing, maintaining, and optimizing Power BI dashboards and reports, as well as analyzing data to uncover trends, patterns, and opportunities for improvement.
Essential Job Functions:
Collaborate with stakeholders to understand their data needs and provide analytical support for strategic decision-making.
Collect and organize data from multiple sources, ensuring data accuracy, completeness, and integrity.
Conduct exploratory data analysis to identify trends, patterns, correlations, anomalies, and opportunities for optimization.
Develop and maintain data models, dashboards, and reports to visualize key performance metrics and communicate insights effectively.
Design, develop, and deploy Power BI dashboards and reports to visualize data and provide insights into key performance metrics.
Communicate findings and recommendations to key stakeholders through written reports, presentations, and data visualizations.
Create data models and perform data cleansing, transformation, and aggregation to ensure data accuracy and consistency.
Stay updated on the latest Power BI features and best practices, and proactively recommend improvements to existing processes and solutions.
Provide training and support to end users on how to effectively utilize Power BI dashboards and reports.
Required Skills:
Due to the sensitivity of customer related requirements U.S. Citizenship is required.
A Bachelor's degree plus 2 years of relevant experience is required. 
Must be able to obtain and maintain a Secret Clearance.
Proven experience in data analysis, including data manipulation, visualization, and interpretation.
Proven experience in developing Power BI dashboards and reports, and visualization design.
Solid understanding of data analysis techniques and statistical methods.
Excellent problem-solving skills and attention to detail.
Strong communication and interpersonal skills, with the ability to effectively collaborate with cross-functional teams.
Desired Skills:
Experience with LLM tools (e.g. ChatGPT, CoPilot) is a plus.
Relevant certifications in Power BI or data analysis are desirable.
Note: This position description is intended to convey information essential to understanding the scope of the job and the general nature and level of work performed by job holders within this job. However, this description is not intended to be an exhaustive list of qualifications, skills, efforts, duties, responsibilities, or working conditions associated with the position. Management reserves the right to modify, add, or remove duties as necessary.
DCS is an EEO compliant company.

Salary Range: $85,373 - $150,000 DCS Corporation is looking for Senior Software Engineer to support tactical systems and subsystems of Navy platforms such as F/A-18 and F-35.   Essential Job Functions: Leads development of Automated Test software and Model Based System Engineering (MBSE) solutions by understanding customer and program intent and requirements. Works closely with the Program Manager and Chief Engineer to design and implement software requirements and solutions. Designs, develops, and implements computer software systems; provides and supports structured process improvement activities. Performs verification and validation, cost and risk, and supportability and effectiveness analysis on various projects. Responsible for the software design, quality, and performance meeting program requirements and customer expectations.  Required Skills: Due to the sensitivity of customer related requirements, U.S. Citizenship is required. Master's Degree in Computer Science highly desired. Secret security clearance required on Day 1, ability to meet and maintain Secret and Special Access security requirements. Experience with Java/C++/Python is required.

This Junior Billing Analyst position will perform all Billing, collection related activities and Contract/Project set-up & maintenance functions in accordance with the FAR and applicable policies and procedure.
Essential Job Functions: 
Preparing invoices in Deltek Costpoint for government and commercial customers in compliance with contractual and FAR regulations for all contract types (CPFP, FFP, and T&M).
Assist and Manage the timely submission of invoices to the Government/prime contractor via WAWF, another portal or e-mail in compliance with contract specific submission requirements.
Read and extract salient information from contract documents to ensure project set-up is correct to ensure proper billing and revenue recognition occurs.
Maintain Deltek Costpoint project information (i.e. contract setup/funding values, period of performance, project labor categories and work force, backlog, etc.) according to contract invoicing and reporting requirements.
Assist and Review Aged Receivables report and work with management to address outstanding receivable invoices over 30 days old, including collection inquiries.
Resolve all billing-related requests and inquiries in a timely manner.
Other duties as assigned, including but not limited to incurred cost submission schedules; audit assistance; and contract close out.
 Maintain and update billing folders and documentations thoroughly and accurately, in accordance with company established guidelines.
Required Skills: 
Due to the sensitivity of customer related requirements, U.S. Citizenship is required.
Minimum Bachelor's degree in Accounting, Finance, business administration or related study a plus.
Excellent attention to detail, organized, and have a clear devotion to meeting billing deadlines.
Must have strong work ethics, reliable, well organized and a self-starter.
Ability to work independently and with a team in a fast-paced and high volume environment with emphasis on accuracy and timeliness.
Ability to communicate effectively and interact with other employees and customers in a professional manner.
Some knowledge of Deltek Costpoint, Excel and other accounting systems.
Desired Skills: 
Some knowledge of invoicing for most contract types (FFP, T&M, CPFF) and government contracting principles pertaining to billing.

This Junior Billing Analyst position will perform all Billing, collection related activities and Contract/Project set-up & maintenance functions in accordance with the FAR and applicable policies and procedure. Essential Job Functions:   Preparing invoices in Deltek Costpoint for government and commercial customers in compliance with contractual and FAR regulations for all contract types (CPFP, FFP, and T&M). Assist and Manage the timely submission of invoices to the Government/prime contractor via WAWF, another portal or e-mail in compliance with contract specific submission requirements. Read and extract salient information from contract documents to ensure project set-up is correct to ensure proper billing and revenue recognition occurs. Maintain Deltek Costpoint project information (i.e. contract setup/funding values, period of performance, project labor categories and work force, backlog, etc.) according to contract invoicing and reporting requirements. Assist and Review Aged Receivables report and work with management to address outstanding receivable invoices over 30 days old, including collection inquiries. Resolve all billing-related requests and inquiries in a timely manner. Other duties as assigned, including but not limited to incurred cost submission schedules; audit assistance; and contract close out.  Maintain and update billing folders and documentations thoroughly and accurately, in accordance with company established guidelines. Required Skills: Due to the sensitivity of customer related requirements, U.S. Citizenship is required. Minimum Bachelor's degree in Accounting, Finance, business administration or related study a plus. Excellent attention to detail, organized, and have a clear devotion to meeting billing deadlines. Must have strong work ethics, reliable, well organized and a self-starter. Ability to work independently and with a team in a fast-paced and high volume environment with emphasis on accuracy and timeliness. Ability to communicate effectively and interact with other employees and customers in a professional manner. Some knowledge of Deltek Costpoint, Excel and other accounting systems. Desired Skills:   Some knowledge of invoicing for most contract types (FFP, T&M, CPFF) and government contracting principles pertaining to billing.

This position will be supporting the Electronic Warfare Division of the Agile Combat Support Directorate located at Wright Patterson AFB, OH.  The applicant shall provide hardware and software engineering support for embedded software, software interfaces, cryptographic systems and interoperability in sensor, weapon, host platform, and communications and command and control systems: including software analysis, Commercial Off-The- Shelf and Government Off-The-Shelf interfacing and performance analysis, software architecture review, software development processes, configuration management processes and tools assessment, and software test systems and capabilities. Essential Job Functions: The applicant shall have knowledge of software engineering in support of the design, development, testing and evaluation, implementation, maintenance, and administration of new and/or existing software systems. The applicant shall assist in the application of an understanding of systems acquisition, systems and subsystems level hardware and software integration, systems requirements analysis and allocation, computer systems architecture, and systems and subsystems testing and evaluation. The applicant shall assist in reviewing/developing/updating of applicable program documentation for software engineering requirements. The applicant shall support the development of the software development strategy and software development plan (SDP). The applicant shall assist in the application of an understanding of aeronautical vehicle systems and/or airborne or related ground systems avionics Operational Flight Program capabilities to support the core engineering tasks as they relate to software engineering. Required Skills: Due to the sensitivity of customer related requirements, U.S. Citizenship is required. Secret clearance. A Bachelor's and 12 years of relevant experience or a Master's and at least 10 years experience in the respective field.

DCS Corp has an immediate opening for a Electronic Warfare (EW) Mission Data (MD) Analyst supporting the United States reprogramming Lab (USRL) and 513th Electronic Warfare Squadron (EWS) on Eglin AFB.
Essential Job Functions: 
The EW MD Analyst will work with other members of the team to develop state-of-the-art mission data for advanced 5th generation fighter aircraft. The ideal candidate's responsibilities will include:
Conduct research and perform intelligence collection to assist in EW programming efforts.
Develop complex electronic warfare models and programs for lab testing.
Program complex mission data files to provide enhanced situational awareness for pilots.
Advise on RF antenna performance.
Provide detailed feedback and support by performing validation and verification analysis, mission data file generation as well as assisting in mission data group management.
Required Skills: 
Due to the sensitivity of customer related requirements, U.S. Citizenship is required.
Bachelor's Degree with 5 years of relevant experience, Associate's degree with 10 years of relevant experience, or high School diploma with 16 years of relevant experience.
Must have or be able to obtain a Secret security clearance.
Desired Skills: 
Experience with programming 4th or 5th generation fighter mission data.
Experience with developing SW supporting creating mission data reports.
Experience with training on mission data SW and programming.
Experience with directing mission data tests in the lab.
Experience with MATLAB.
Experience with Intel sources such as CED, EWIRDB, and NGES.
Experience with electronic countermeasures to include: V&V test plans AESA radar systems, HFIM, and EW modulation on pulse.
Familiarity with F-35 avionics.

DCS Corp has an immediate opening for an Electronic Warfare (EW) Mission Data (MD) Engineer supporting the USRL and 513th Electronic Warfare Squadron on Eglin AFB. Essential Job Functions: The EW MD Engineer will work with other members of the MD team to develop state-of-the-art MD for advanced 5th generation fighter aircraft. The ideal candidate's responsibilities will include: Conduct research and perform intelligence collection to assist in F-35 EW Suite MD re-programming efforts. Develop complex EW models and programs, including automation tool utilization/design, to increase efficiency for lab testing and analysis. Program complex MD Files to provide enhanced situational awareness for F-35 pilots. Advise on RF components, characteristics, and antenna performance parameters to assist in MD re-programming efforts. Provide detailed feedback and support by performing validation and verification analysis, MD File Generation, as well as assisting in MD group management. Required Skills: Due to the sensitivity of customer related requirements, U.S. Citizenship is required. Bachelor's Degree in an Engineering discipline with eight (8) years of relevant experience. Electrical Engineering degree is preferred. Must have a Secret security clearance. Desired Skills: Experience with programming 4th or 5th generation fighter MD. Experience with developing SW supporting creating MD reports and automation. Experience with training on MD SW and programming. Experience with directing MD testing in a lab setting. Experience with MATLAB. Experience with Intel sources such as CED, EWIRDB, and NGES. Experience with the MD repository & re-programming application, SPECTRE. Experience with V&V test plans AESA radar systems, HFIM, and EW modulation on pulse. Familiarity with F-35 avionics. 6136

DCS Corp has an immediate opening for an Electronic Warfare (EW) Mission Data (MD) Engineer supporting the USRL and 513th Electronic Warfare Squadron on Eglin AFB. Essential Job Functions: The EW MD Engineer will work with other members of the MD team to develop state-of-the-art MD for advanced 5th generation fighter aircraft. The ideal candidate’s responsibilities will include: Conduct research and perform intelligence collection to assist in F-35 EW Suite MD re-programming efforts. Develop complex EW models and programs, including automation tool utilization/design, to increase efficiency for lab testing and analysis. Program complex MD Files to provide enhanced situational awareness for F-35 pilots. Advise on RF components, characteristics, and antenna performance parameters to assist in MD re-programming efforts.  Provide detailed feedback and support by performing validation and verification analysis, MD File Generation, as well as assisting in MD group management. Required Skills: Due to the sensitivity of customer related requirements, U.S. Citizenship is required. Bachelor's Degree in an Engineering discipline with eight (8) years of relevant experience. Electrical Engineering degree is preferred. Must have a Secret security clearance. Desired Skills: Experience with programming 4th or 5th generation fighter MD. Experience with developing SW supporting creating MD reports and automation. Experience with training on MD SW and programming. Experience with directing MD testing in a lab setting. Experience with MATLAB. Experience with Intel sources such as CED, EWIRDB, and NGES. Experience with the MD repository & re-programming application, SPECTRE. Experience with V&V test plans AESA radar systems, HFIM, and EW modulation on pulse. Familiarity with F-35 avionics.

DCS Infoscitex Sector has an opportunity for an enthusiastic Autonomy Software Engineer/Software Developer to join our Aerospace Technology Development team in our Dayton, Ohio facility.  Do you want to apply your agile software experience to create innovative solutions that support a focused, multi-year effort to develop a comprehensive autonomous control system for air platforms to enable maneuvering, energy management, communications, sensing, user interface and performance monitoring/evaluation? Are you ready to contribute your skills alongside government and industry experts? Are you passionate about creating game-changing technology solutions? DCS Corporation is looking for you!  We have an immediate need for an experienced, solutions-oriented computer scientist, computer engineer or software developer to augment our extensive autonomy software development, modeling, simulation, and analysis efforts. 
Essential Job Functions: Interpret customer application requirements and identify research gaps in control and path planning. Formulate problems using developed models. Analyze/solve continuous and discrete optimization problems. Implement theoretical research into practical algorithms. Implement algorithms and software (Python, Julia, and/or C++) for route/motion planning. Develop path planning algorithms that can be eventually deployed on hardware. Document findings for technical publications and assist in integrating algorithms into customer simulation tools. Collaborate within Agile-based teams to design, develop, test, and deploy autonomy and control software. Engage with government and industry customers to define requirements, present results, and innovate solutions. Occasionally travel for short-term assignments. Required Skills: Due to the sensitivity of customer related requirements, U.S. Citizenship is required. At least an MS degree in engineering, mathematics, computer science, or related technical discipline and at least four years of related experience (a focus on optimization is preferred). Applicants selected will be subject to a U.S. Government background investigation and must meet eligibility requirements for access to classified information: must be able to attain at least a Secret level security clearance. Experience developing software using programming languages such as Python, Julia, or C++. Ability to work well in team-oriented environments. Ability to complete individual tasking. Ability to travel, if needed. Experience working with source code control systems (specifically Git). Desired Skills: Active U.S. DoD security clearance. Experience working in a Linux environment. Experience and understanding of autonomy and control systems. Experience with modeling, simulation, and analysis. Experience developing numerical algorithms and floating point arithmetic. Proficiency solving mathematical and physics-based problems of moderate to high complexity. Domain knowledge in an engineering discipline relating to aerospace and defense (e.g., Aero, G&C, EE).

Dcs Corp Interview Questions

Dcs Corp Interview Guides

Dcs Corp Interview Questions

Dcs Corp Salaries by Position

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