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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?

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

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PURPOSE OF POSITION: The Business Analyst (BA) is a technology resource acting as a liaison between technology teams and the business on medium to large IT projects. The BA is responsible for the elicitation of stakeholder business requirements, their assessment, documentation and translation to technology teams. The Business Analyst serves the business working closely with technology teams to ensure that business needs are met through technical solutions. As part of a highly collaborative team, the role will interact with many technical and business resources across the enterprise. The ideal candidate is a committed, creative, self-motivated technologist who is interested in practicing his or her skills and learning new ones. TASKS AND RESPONSIBILITIES: The following duties are essential to the successful and satisfactory performance of this job. Other duties may be assigned. Collaborate with Business Relationship Managers, stakeholders, and subject matter experts to define business problems, objectives and scope of new projects Prepare reports by collecting, analyzing, and summarizing information and trends Collaborate with business stakeholders and technology team members to elicit, analyze, and validate business requirements for new products and cross-platform features & enhancements Document business requirements in an organized, traceable manner Translate vision, business needs & requirements to business stakeholders and development teams Collaborate with business stakeholders and technology team members to define product concepts and technical solution designs Evaluate technology solutions, including off-the-shelf components, to ensure that they meet business requirements Translate technical solutions and constraints to business Develop business cases including solutions approach options, benefits, impact assessment, risks, assumptions & product cost/benefit Assist in the development of roadmaps, release plans & project planning activities Assist in the analysis and definition of user stories to support grooming activities Evaluate technology deliveries to meet business objectives Support the development of user acceptance and quality assurance tests Collaborate with project stakeholders to manage scope, requirements and organizational change management required to adopt processes and technology delivered by the project MINIMUM EDUCATION: Bachelor's degree from an accredited institution or equivalent industry experience CBAP Certification preferred. MINIMUM EXPERIENCE: 3+ years of professional experience as an IT business analyst or comparable role on medium/large-scale software development projects KNOWLEDGE, SKILLS, ABILITIES: Solid experience in business analysis planning and monitoring, elicitation, requirements analysis, design definition and solution evaluation Strong facilitation, critical / analytical thinking, and problem-solving skills Strong requirements modeling & process mapping skills Experience with both traditional Waterfall and Agile / Lean methodologies Excellent MS-Excel, SQL and Visio skills. TFS experience preferred Strong communication skills and the ability to communicate appropriately at all levels of the organization; this includes written and verbal communications as well as visualizations Ability to build strong partnerships and influence decision makers as well as process and technology adoption Proactively understand functional business areas and how they interact/overlap with each other Experience modeling business processes using a variety of tools and techniques Extensive experience planning and deploying both business and IT initiatives Strong business acumen Experience in defining and maturing business capability road maps PHYSICAL DEMANDS AND WORK ENVIRONMENT: The physical demands and work environment described here are representative of those that must be met and/or encountered by an employee to successfully perform the essential functions of this job. Reasonable accommodations may be made to enable individuals with disabilities to perform the essential functions. While performing the duties of this job, the employee is regularly required to use hands to finger, handle, or feel; reach with hands and arms; and communicate. The employee may be required to stand, walk, and sit. Specific vision abilities required by this job include the ability to view monitors, technical documents, and reference material. The noise level in the work environment is usually low to moderate

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