IBM Data Science Test 2025 – 400 Free Practice Questions to Pass the Exam

A/B testing is a fundamental technique used in data science primarily to compare two or more variants of a particular element in order to determine which one performs better. It involves splitting a sample population into two groups where one group is exposed to a control variant and the other to a modified version. The performance can be measured using various metrics, such as conversion rates, click-through rates, or user engagement. By analyzing the outcomes, data scientists can make data-driven decisions, optimize performance, and validate the effectiveness of changes or new features.

Through A/B testing, organizations can systematically test hypotheses about user behavior and preferences, ensuring that decisions are supported by quantitative evidence rather than intuition. This method is widely used in marketing, product development, and user experience design, among other fields, making it a powerful tool for improving outcomes based on data insights.

Other choices, while relevant to data science, do not represent the primary role of A/B testing in evaluating performance against metrics or variants directly. For example, developing new data collection methods and analyzing singular data points are important aspects of the data science workflow but are not specific to the comparative nature of A/B testing. Validating results of previous tests is also a significant item but it is more about confirming findings rather than the