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Suppose there exists a new airline named Jetco that flies domestically across North America. Jetco recently had a study commissioned that tested the boarding time of every airline, and it came out that Jetco had the fastest average boarding times of any airline.

What factors could have biased this result, and what would you look into?

What could potentially bias the average boarding time in favor of an airline that only flies domestically?

What could potentially bias the average boarding time in favor of an airline that only flies domestically?

Boarding Times Bias

A new airline came out as the fastest average boarding times compared to other airlines.  What factors could have biased this result and what would you look into?

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 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

Drivetime Salaries by Position

**Whats Under the Hood** DriveTime Family of Brands is the largest privately owned used car sales finance & servicing company in the nation. Headquartered in Tempe, Arizona and Dallas, Texas, we create opportunities and improve the lives of our customers and our employees by placing a focus on putting the right customer, in the right vehicle, on the right terms and on their path to ownership. The DriveTime Family of Brands spans across DriveTime, Bridgecrest and SilverRock. You can find us at the intersection of technology and innovation as we use our proprietary tools and over two decades of industry knowledge to redefine the process of purchasing, financing, and protecting your vehicle. **Thats Nice, But Whats the Job?** The role of IT Business Analyst takes on a different meaning in every company. Here at DriveTime, the emphasis is on enabling "Business" value through IT solutions. On a daily basis, you are responsible for eliciting requirements on updates and enhancements to DriveTime applications, but this role is so much more than requirements writing. From API integrations and database structures to page layouts and built-from-scratch applications, you are an expert at digging in and understanding how systems work together. In business meetings you are the technical voice who can speak to the systems impact. In discussions with developers, you are the voice of the business advocating for your customer. You really get the big picture and business goal, and are adept at translating that into the details needed for your team to make the goal a reality. You play an integral, collaborative role in feature development, from business ask through user acceptance testing and deployment. **Our IT Business Analyst responsibilities are to:** Work with Product Owners and end users to develop thorough requirements Create concise and relevant project artifacts and build reports that tell a story Work as a member of cross-functional teams to help design solutions Develop user stories centered on the business value Work with a team of developers to ensure requirements are met and provide insight during development Create test strategy/scenarios based on feature/project scope Understand how individual test cases (within the test pyramid) provide coverage of the scenarios Identify regression suites/testing that is needed for a feature/project Assist Team with manual testing as needed, perform exploratory testing Assist Solutions Owner in entering, triaging and managing bugs Communicate with all levels of the organization (end users - sr. executive level) Function as a subject matter, process, and operational expert for supported Product Line Assist in troubleshooting complex systems issues **So What Kind of Folks Are We Looking for?** **Organization and time management skills in spades.?** Youll be handling multiple projects and deadlines that will require you to prioritize then re-prioritize then re-prioritize again. **Expert in relationships!** ?Youve probably taken multiple personality assessments, know what Emotional Intelligence is, and pride yourself on your ability to build relationships based on mutual trust and respect. **Excellent verbal and written communication skills -?** the ability to talk and write with confidence, charisma and competence for a wide variety of audiences. **Detail-oriented.?** Okay we know its on about every job description - but we really mean it! **The Specifics.** Youve got a minimum of 5 years Business/Solutions Analysis experience, preferably working in an Agile environment. Whether it be homegrown IT systems or out-of-the-box software implementations, youve worked on systems that are used company-wide by lots of users. Collaboration, collaboration and one more time, collaboration. You are an experienced liaison who can bring all stakeholders together and, more importantly, get them to agree. Creating workflows, brainstorming use cases and coming up with clear, concise user stories are finely honed skills for you. Its in the job title. Youve got solid analytical skills. Be it tables of data or end-user flows, you know how to analyze and organize. Once youve analyzed and organized, you can create a compelling story with your excellent written and verbal skills. Understand how to build a test strategy including positive/negative testing, boundary testing, etc. Working knowledge of the Test Pyramid and how it impacts test strategy and test case design Bonus: Risk-based testing strategies You are a highly motivated self-starter who doesnt need to be micromanaged. You think with a business owner mindset and are consistently anticipating business needs. Financial Services, Auto Lending, or similar industry experience a plus **Nice to Haves.** While the Microsoft Office Suite is a given (Word, Excel, Visio, PowerPoint, Project), experience working in or using any of the following applications is a plus Microsoft SQL Tableau Application Insights Miro Target Process, Jira or other SDLC board management tools Azure DevOps Adobe Creative Suite (Photoshop, Illustrator, XD) Balsamiq or any other wireframe tool Any equivalent combination of education, training and/or experience that fulfills the requirements of the position will be considered. #Dice **So What About the Perks? Perks matter** + **Medical, dental, and vision, oh my!** DriveTime Family of Brands covers a sizable amount of insurance premiums to ensure our employees receive top-tier healthcare coverage. + **But Wait, Theres More.** 401(K), Company paid life insurance policy, short and long-term disability coverage to name a few. + **Growth Opportunities.** You grow, I grow, we all grow! But seriously, DriveTime Family of Brands is committed to providing its employees with every opportunity to grow professionally with roughly over 1,000 employees promoted year over year. + **Tuition Reimbursement.** Were as passionate about your professional development as you are. With that, well put our money where our mouth is. + **Wellness Program.** Health is wealth! This program includes self-guided coaching and journeys, cash incentives and discounts on your medical premiums through engaging in fun activities! + **Gratitude is Green.** We offer competitive pay across the organization, because, well money matters! + **In-House Gym.** We want our employees to be the best versions of themselves. So come early, take a break in your day or finish strong with a workout! + **Give Us a Reason (or not), and Well Celebrate.** Regardless of whether there is a holiday or not, we are finding ways to kick back and enjoy each others company outside of day-to-day work. + **Smart-Casual Dress.** Come dressed in jeans (youll fit right in with the rest of us). + **Paid Time Off & Paid Holidays.** Not just lip service: we work hard, to play hard. **Anything Else? Absolutely.** DriveTime Family of Brands is Great Place to Work Certified! And get this: 90% of our rockstar employees say they feel right at home here. We could spend a lot of time having you read about ALL our awards, but well save time (and practice some humility) just naming a few others; Comparably Awards: Best Company for Diversity, Best Company Culture and Best Company Leadership, oh and dont forget Phoenix Business Journal Healthiest Employers (okay, well stop there)! Hiring is contingent upon successful completion of our background and drug screening process. DriveTime is a drug-free, tobacco-free workplace and an Equal Opportunity Employer. And when it comes to hiring, we don't just look for the right person for the job, we seek out the right person for DriveTime. Buckle up for plenty of opportunities to grow in a professional, fun, and high-energy environment!

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