Measurement

5 minutes 5 Questions

Measurement is the process of collecting data on how the test groups interact with each version of the product. This data needs to be directly related to the hypothesis defined in the initial stages of the test. The key measurable metrics might include click-through rate, conversion rate, bounce ra…

Guide to Measurement in AB Testing for PMI-ACP

Measurement in AB testing is critical for the PMI-ACP (Project Management Institute - Agile Certified Practitioner) exam.

Importance: It is important because it allows a project manager to make data-driven decisions based on actual user responses. This directly results in higher user satisfaction and product efficiency.

What is Measurement in AB Testing: Measurement is the process of collecting and analyzing data from different variants of a product to determine which variant performs better. AB testing involves testing two variants (A and B) against each other to identify the one that performs better.

How it works: In AB testing, traffic is split between two different variants of a product. Data is collected from user interactions, and metrics such as conversion rate, bounce rate, average session time, etc., are measured. The variant with better performance metrics is consider as the successful variant.

How to Answer Questions: When answering questions on measurements in exams, keep a clear understanding of the metrics used, their importance, and how they influence the decision-making process. Understand the basic idea of statistical significance, as it is used in deciding the testing outcome.

Exam Tips: Answering Questions on Measurement
1. Understand the metrics: Different metrics tell different stories. While some metrics could be primary, i.e., directly linked to the objectives, some could be secondary.
2. Always use relative comparison: Instead of quoting the absolute numbers, use relative difference between the variants.
3. Understand statistical significance: Ensure you understand the level of statistical significance required before a variant can be declared as a winner.

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PMI-ACP - Measurement Example Questions

Test your knowledge of Measurement

Question 1

Your Agile project's release date is fast approaching, but you've noticed discrepancies between planned work and completed work, affecting your project's predictability. As a Scrum Master, what type of graph or chart should you consider using to express these differences most effectively?

A Simple Line Graph A Cumulative Flow Diagram A Pie Chart A Gantt Chart

Correct Answer: A Cumulative Flow Diagram

The best chart to use in this situation is a Cumulative Flow Diagram (CFD). The CFD is an area chart that depicts the quantity of work in different states of progress. It helps visualize the flow of work across various stages within a system such as a project. This makes it an effective tool to identify bottlenecks and measure the predictability of a system. The Gantt Chart, while useful in project management to illustrate a project schedule, does not provide the level of detail needed to effectively measure and visualize the flow of work across various states. A Pie Chart, although effective in displaying the proportion of parts to a whole, is not suitable for tracking changes over time. A Simple Line Graph is useful to display a trend over time, but it cannot simultaneously depict the amount of work in different states of progress. Hence, a Cumulative Flow Diagram is the most suitable chart to highlight discrepancies between planned work and completed work.

Question 2

The Scrum Master has noticed a substantial spike in defects and is considering using a tool to visualize and monitor them. What type of chart would be best for this situation?

Burn Up Chart Cumuflow Diagram Velocity Chart Defect Density Chart

Correct Answer: Defect Density Chart

In the context of Scrum, a spike in defects is best tracked and visualized using a Defect Density Chart. Such a chart provides a clear overview of the number of defects compared to the size of the development effort. This is extremely useful for a Scrum Master because it enables the team to detect patterns and trends in the defect occurrence, consequently enabling proactive measures to enhance the quality of the product being developed. A Velocity Chart, on the other hand, is used to track the amount of work completed in each Sprint and does not deal directly with defects. Thus, it's not applicable to the context of the question Similarly, a Burn Up Chart is another visual tool showing the progress of completed work against the total scope of a project. Although it can help to provide an overall snapshot of the project's status, it doesn't focus on tracking defects Lastly, the Cumuflow Diagram is used to visualize the workflow and spot bottlenecks in a process. While it's useful for identifying issues related to workflow, it does not specifically deal with monitoring defects in a project.

Question 3

The Kanban team is looking to improve their workflow and remove inefficiencies. They are considering a metric that can provide a visual representation of work stages. Which metric should they choose?

Gantt Chart Cumulative Flow Diagram Defect Density Chart Velocity Chart

Correct Answer: Cumulative Flow Diagram

The best metric for the Kanban team to improve their workflow and remove inefficiencies would be the Cumulative Flow Diagram. This diagram indicates how much work is in any given state at a time, allowing the team to visualize their workflow and identify any bottlenecks or areas of inefficiency. On the other hand, Velocity Chart is more about showing the amount of work completed in each iteration and is more applicable to Scrum. Gantt Chart is a planning tool that visualizes project schedule and is less about workflow efficiency. Defect Density Chart is used to measure the quality of the software by tracking number of defects, which doesn't directly improve workflow.

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