Question 43 • Probability and Statistics with Applications Honors Sem-1-FL-1210300 (2024-2025)
An experiment is proposed to measure the effectiveness of a brand of sunscreen. Adult volunteers are randomly assigned to one of two brands of sunscreen and asked to enjoy a normal day at the beach. Each volunteer is asked to report back to the administrators after two hours, at which time both arms are assessed for sun exposure.
Answer
A
The volunteers are the explanatory variables.
B
The brands of sunscreen are the response variables.
C
The amount of time in the sun is the response variable.
D
The brands of sunscreen are the explanatory variables.
Explanation
The explanatory variable is the factor researchers assign or vary: which brand of sunscreen each volunteer uses. The response variable is the sun exposure measured after two hours, so the brands of sunscreen are the explanatory variables.
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