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Systems planning and analysis, inc. Interview Questions

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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

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?

In an A/B test, how can you check if assignment to the various buckets was truly random?

In an A/B test, which of the following is a common method to determine if the assignment to the test groups was truly random?

In an A/B test, which of the following is a common method to determine if the assignment to the test groups was truly random?

Random Bucketing

Systems planning and analysis, inc. Salaries by Position

OverviewSystems Planning and Analysis, Inc. (SPA) delivers high-impact, technical solutions to complex national security issues. With over 50 years of business expertise and consistent growth, we are known for continuous innovation for our government customers, in both the US and abroad. Our exceptionally talented team is highly collaborative in spirit and practice, producing Results that Matter. Come work with the best! We offer opportunity, unique challenges, and clear-sighted commitment to the mission. SPA: Objective. Responsive. Trusted.The Joint, Office of the Secretary of Defense, Interagency Division provides expert support services to a range of customers spanning across the Department of Defense, Federal Civilian, and international markets. JOID provides a diverse portfolio of analytical and programmatic capabilities to help our customers make informed decisions on their most challenging issues.JOID assists the Defense Threat Reduction Agency (DTRA) in developing leading edge technologies to counter WMD in support of CCMDs and transitioning these technologies to military services and COCOMs. SPA provides expertise across the full range of chemical, biological, radiological, nuclear and high-yield explosives (CBRNE) WMD, Counter Improvised Threat and Countering Threat Network technologies to support understanding, detection, identification, characterization, denial, control, disabling, defeating, disposing, safeguarding the force, managing consequences, and test and evaluation in support of military and civilian operations.We have a need for a Chem/Bio Data Science Intern to provide onsite support out of Edgewood, MD (Aberdeen Proving Grounds) with occasional travel to Alexandria and/or Lorton, VA.ResponsibilitiesWe are seeking a smart, energetic, and dedicated individual who is either an advanced undergraduate (declared major) or actively pursuing a Masters or PhD degree in Data Science, Statistics, Mathematics, CS, or a related field to work alongside an SPA mentor in support of data development and analysis for DTRA Research & Development programs. The individual should have some chemistry experience and experience working with chemical data sets. The successful intern will be a quick learner and key contributor to analysis, projects, presentations and discussions.This internship is primarily in office work with occasional telework allowed. Timeline for this job opportunity: We are currently accepting applications for this paid internship and will make offers contingent on the ability to obtain a DoD Security Clearance for a summer 2025 start date.QualificationsRequired:* Be enrolled in a Master's or PhD program in Data Science, Statistics, Mathematics, Bio-informatics or related field* Experience with chemistry or working with chemical data sets* Willingness to learn program/organizational processes and procedures* Creative thinking and strong problem solving skills* Strong leadership, communications, and organizational skills* The ability to delve into technical details and translate those into findings and recommendations.* U.S. Citizenship with the ability to obtain a DoD Secret or Top Secret clearanceOptions

Overview: Systems Planning and Analysis, Inc. (SPA) delivers high-impact, technical solutions to complex national security issues. With over 50 years of business expertise and consistent growth, we are known for continuous innovation for our government customers, in both the US and abroad. Our exceptionally talented team is highly collaborative in spirit and practice, producing Results that Matter. Come work with the best! We offer opportunity, unique challenges, and clear-sighted commitment to the mission. SPA: Objective. Responsive. Trusted. The Strategic Division (SD) supports high-reliability organizations including Navy Strategic Systems Programs (SSP), Air Force Nuclear Weapons Center, and the Department of Energy (DOE), among others. Our support across our client base is expanding rapidly and encompasses important services, such as data analytics and visualization, threat analysis, risk management, modeling and simulation, cost estimating, earned value management, program management, system engineering, independent evaluation, and High Consequence Event prevention. The Surety Programs Group (SPG) supports government and private sector management of complex safety, security, and reliability programs for high consequence operations. SPG delivers industry-leading, innovative, and value-added services such as data analytics and visualization, threat analysis, risk management, modeling and simulation, program management, system engineering, independent evaluation, and High Consequence Event prevention to help our clients understand and mitigate mission risks spanning physical, cyber, and human domains. SPG has an immediate or near term need for a Data Scientist that will work as part of a cross-functional team responsible for systematically evaluating client threats, vulnerabilities, performance, and cost-risk trades. Responsibilities: SPG is seeking a junior-mid level Data Scientist to provide analytical support for SPA customers in the national security and high consequence operations spaces. <ul><li>Conduct data gathering, mining, and analysis to explore data from disparate sources and formats.</li><li>Work with senior data scientists and operations research analysts with development and implementation of new analytical capabilities and tools.</li><li>Transform data and analysis into informative data visualizations and interactive dashboards for technical and non-technical audiences.</li><li>Derive insights and analytics narratives from data for effective storytelling and clear communication in response to client questions/requirements.</li><li>Apply critical and analytical thinking skills to translate complex information into understandable work products.</li></ul> Qualifications: Required Qualifications:<ul><li>U.S. citizen with DoD Security Clearance (or ability to obtain DoD Security Clearance).</li><li>Bachelors degree in Mathematics, Statistics, Operations Research, Computer Science, Engineering, Physics, quantitative social sciences, or related discipline.</li><li>3+ years experience with data gathering, cleaning, storage, mining, analysis, and visualization.</li><li>3+ years experience with data analysis tools such as R, Tableau, Python, MATLAB, SAS, Stata, etc.</li><li>Experience developing database systems using either SQL Server or Access.</li></ul> Desired Qualifications: <ul><li>Masters degree in Mathematics, Data Science, Data Analytics, Computer Science, Statistics, Operations Research, or related discipline.</li><li>Experience with statistical modeling.</li><li>Experience with Machine Learning/AI.</li><li>Experience with Model-Based Systems Engineering (MBSE).</li></ul>

Systems planning and analysis, inc. Interview Questions

Systems planning and analysis, inc. Interview Guides

Systems planning and analysis, inc. Interview Questions

Systems planning and analysis, inc. Salaries by Position

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