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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?

Statistics

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 you work for a social media company that has just done a launch in a new city. Looking at weekly metrics, you see a slow decrease in the average number of comments per user from January to March in this city.

The company has been consistently growing new users in the city from January to March.

What are some reasons why the average number of comments per user would be decreasing and what metrics would you look into?

What metric could be used to measure if active users are still engaging on the platform despite an overall decrease in the average number of comments per user?

What metric could be used to measure if active users are still engaging on the platform despite an overall decrease in the average number of comments per user?

Decreasing Comments

How would you investigate a decline in the average number of comments per user?

Product Metrics

<h3>Job Description</h3><div>Job Description<div>Salary: About Us At ReachMobi, data drives all our decision-making. Data Analysts work across all aspects of their App Studio to help shape the future of the product by processing, analyzing and interpreting huge data sets. Using analytical excellence and statistical methods, you mine through data to identify opportunities for growth, from enhancing advertising efficacy to studying user behavior. Identifying the problem is only half the job; you also figure out the solution and analyze the results. How You'll Make an Impact: Own the end-to-end process of querying, validating, and analyzing large datasets to uncover insights that inform strategic decisions.Partner with team leaders and stakeholders to forecast user lifetime value (LTV), acquisition costs, retention, and engagement trends.Conduct deep-dive analyses on user acquisition (UA) performance, campaign effectiveness, and product usage behavior.Ensure data accuracy and consistency by auditing sources, defining metrics, and improving reporting processes.Build and maintain advanced SQL queries and Excel models to support forecasting, performance tracking, and optimization.Mentor junior analysts by reviewing work, sharing best practices, and guiding analytical approaches.Translate complex data findings into clear, actionable recommendations for non-technical stakeholders, enabling confident business decisions. What You Need: 57 years of experience as a Data Analyst, with significant exposure to product analytics, user acquisition, or performance marketing data.Advanced SQL expertise; ability to write complex queries, optimize performance, and work autonomously with large datasets.Mastery of Excel for modeling, analysis, and visualization (pivot tables, VLOOKUP, SUMIF, nested formulas, etc.).Strong experience validating data integrity and ensuring confidence in analytic outputs.Ability to structure ambiguous business questions, develop analytical approaches, and deliver insights that influence decisions.Excellent communication skills, capable of simplifying technical findings for leadership and cross-functional teams.Experience mentoring or guiding junior analysts. Why ReachMobi? We offer a fun, work hard play hard cultureNo dress code policy! Wear your flip flops and shorts in the summerHybrid scheduleUnlimited Paid Time Off along with 10 paid holidays401k match up to 4%, Health/Vision/Dental, Flexible Spending AccountsLife Insurance, AD&D, STD and LTD 100% employer paidSponsorship availableComplimentary snacks, beverages, beer fridge, as well as catered lunchesLocated next to world-class shopping and restaurantsRegular company-sponsored social events to connect with your team and fellow colleagues! - check out our Instagram to see moreThis is an opportunity to be with an industry leading company that continues to experience tremendous growth ReachMobi lives at the junction where the science of cutting-edge technology meets with audience engagement to create a new and powerful force that fosters real, long-term relationships with users. We pride ourselves on leading the industry in mobile engagement and monetization. Weve gathered a one-for-all minded, world-class team of innovative developers, marketing ninjas, imaginative designers and content developers whose zeal for what they do is slightly north of fanatical. Seriously obsessive.</div></div>

<h3>Job Description</h3><div>Job Description<div>Salary: About Us An industry-leading mobile app developer, ReachMobi works tirelessly to connect users to a mobile experience that is completely tailored around the end-user. Our invaluable array of apps provides users with the power to transform their devices into something that perfectly aligns with their personalities and passions while enhancing functionality and customization.We are looking for an entrepreneurial Product Manager who can execute the vision provided by the App Studio Manager (ASM) and drive product success. This role requires someone who can dive deep into data, analyze whats working and whats not, and make strategic decisions to improve product performance. Rather than being the one who invents the product, this individual will drive the product forward through data-driven insights and execution. How Youll Make an Impact<ul><li>Lead & Collaborate: Work closely with our App Studio Manager to guide teams through ideation, technical development, and product launches. </li><li>Own & Grow: Take full ownership of your product area, helping to expand a ReachMobi vertical (big keyboard, email, messenger, etc.) with a strong focus on Android Launchers. </li><li>Launch & Iterate: Develop, launch, and refine new products and features based on performance data and user insights. </li><li>Think Strategically: Stay ahead of industry trends, mobile user acquisition strategies, and competitor movements to fuel growth. </li><li>Execute & Adapt: Deeply understand the technical details and key performance indicators of our products, ensuring continuous optimization. </li><li>Problem-Solve in Real Time: Execute on a visionwhen given a formula for success, be able to implement it, assess the results, and make data-driven adjustments to improve outcomes.</li></ul> What You Need<ul><li>3 years experience creating product roadmap(s) and product strategy.</li><li>Strong analytical skills with hands-on experience in Excel (pivot tables, VLOOKUP, visualization, etc.).</li><li>SQL querying experience to extract and analyze data.</li></ul><ul><li>Ability to break down complex problems into actionable steps that drive product development in a fast-paced environment.</li><li>Understanding of key product metrics, including cost per acquisition (CPA), revenue per user, click-through rates (CTR), retention rates, and lifetime value (LTV).</li></ul>Why ReachMobi?<ul><li>We offer a fun, work hard play hard culture</li><li>No dress code policy! Wear your flip flops and shorts in the summer</li><li>Hybrid schedule</li><li>Unlimited Paid Time Off along with 10 paid holidays</li><li>401k match up to 4%, Health/Vision/Dental, Flexible Spending Accounts</li><li>Life Insurance, AD&D, STD and LTD 100% employer paid</li><li>Sponsorship available</li><li>Complimentary snacks, beverages, beer fridge, as well as catered lunches</li><li>Located next to world-class shopping and restaurants</li><li>Regular company-sponsored social events to connect with your team and fellow colleagues! - check out our Instagram to see more</li><li>This is an opportunity to be with an industry leading company that continues to experience tremendous growth</li></ul></div></div>

<h3>Job Description</h3><div>Job Description<div>Salary: About ReachMobi An industry-leading mobile app developer, ReachMobi works tirelessly to connect users to a mobile experience that is completely tailored around the end-user. How Youll Make an Impact <ul><li>Lead the development and scaling of complex, high-volume, high-availability analytical systems and applications.</li><li>Own the design, architecture, and technical decisions for major components or systems.</li><li>Mentor and guide junior/mid-level engineers, including code reviews and technical coaching.</li><li>Partner with product, design, and other teams to define requirements and deliver high-impact solutions.</li><li>Identify and implement improvements in system performance, scalability, and reliability.</li></ul>What You Need <ul><li>57 years of professional experience building and scaling high-volume, high-availability web and mobile applications.</li><li>Deep expertise with C#/.NET and modern software development practices.</li><li>Hands-on experience with AWS technologies (EC2, RedShift, DynamoDB, Firehose, Kinesis).</li><li>Exposure to digital advertising technologies (e.g., AdMob) a plus.</li><li>Proven ability to work through complex, ambiguous problems with minimal guidance.</li><li>Track record of mentoring engineers and influencing engineering best practices.</li><li>Passion for delivering high-quality, user-focused applications.</li></ul> The ReachMobi team is looking for those who are passionate about software development and have a strong understanding of the fundamentals - regardless of whether you took a traditional path to software development. Self-taught? Bootcamp grad? Freelance? If you feel confident in your knowledge of mobile development and have experience putting that knowledge to work, please apply! Were ready for you to make a splash on the brand!Why ReachMobi? <ul><li>We offer a fun, work hard play hard culture.</li><li>No dress code policy! Wear your flip flops and shorts in the summer.</li><li>Hybrid schedule</li><li>Unlimited Paid Time Off along with 10 paid holidays</li><li>401k match up to 4%,Health/Vision/Dental, Flexible Spending Accounts</li><li>Life Insurance, AD&D, STD and LTD 100% employer paid.</li><li>Visa Sponsorship available</li><li>Complimentary snacks, beverages, beer fridge, as well as catered lunches</li><li>Located next to world-class shopping and restaurants.</li><li>Regular company-sponsored social events to connect with your team and fellow colleagues! - check out ourInstagramto see more.</li><li>This is an opportunity to be with an industry leading company that continues to experience tremendous growth.</li></ul></div></div>

Question	Topic	Difficulty	Ask Chance
Boarding Times Bias	Statistics	Medium	Very High
Hundreds of Hypotheses	Statistics	Medium	Very High
Decreasing Comments	Product Metrics	Easy	Very High

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