CompTIA Data+ (DA0-001) — Question 84

A data analyst is using a two-tailed, independent t-test to determine whether the type of stretching, dynamic or static, has any influence on a dancer’s flexibility. Which of the following is the alternative hypothesis?

Answer options

• A. A dancer’s flexibility is improved through static stretching.
• B. The change in a dancer’s flexibility is not equal to zero.
• C. There is a difference in a dancer’s flexibility between static and dynamic stretching.
• D. The means of the static and dynamic stretching groups do not differ from each other.

Correct answer: C

Explanation

The alternative hypothesis (C) suggests that there is a difference in flexibility between the two stretching types, which is the focus of the test. Option A is too specific to static stretching alone, while option B refers to a non-directional change, not directly addressing the comparison. Option D indicates no difference, which contradicts the alternative hypothesis.