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.