Question

Chrissy ran an experiment where she tested a product placement inserted in a documentary film. She did a pretest and a posttest asking participants to indicate their level of knowledge of various brands. She wants to compare the knowledge level of participants of her brand before the documentary and after the documentary to see if the product placement influenced knowledge of the brand. The best test for Chrissy to use is the:

Group of answer choices
a. one sample t-test
b. independent sample t-test
c. paired sample t-test
d. ANOVA test

Answer 1

The best test for Chrissy to use to compare participants' knowledge of a brand before and after a documentary is the paired sample t-test (option c) since it is designed for situations where the same participants are measured twice under different conditions.

Step-by-step explanation:

The question from the student is about determining the best statistical test to compare participants' level of knowledge of a brand before and after watching a documentary with a product placement. Since Chrissy is looking to compare the same group of participants' knowledge before and after the exposure, the appropriate test is the paired sample t-test.


A paired sample t-test, also known as a dependent sample t-test, is used when the same participants are measured twice under different conditions. In contrast, the independent sample t-test is used for comparisons between two separate groups. The one-sample t-test is used when comparing a single group to a known value or a theoretical expectation. An ANOVA, or analysis of variance, is typically used when comparing means across more than two groups or levels.