A researcher is investigating which of two newly developed automobile engine oils is better at prolonging the life of an engine. Since there are a variety of automobile engines, 20 different engine types were randomly selected and were tested using each of the two engine oils. The number of hours of continuous use before engine breakdown was recorded for each engine oil. Based on the information provided, what type of analysis will yield the most useful information?
A) Matched pairs comparison of population means.
B) Matched pairs comparison of population proportions.
C) Independent samples comparison of population proportions.
D) Independent samples comparison of population means.

Question

Quizplus · Accepted Answer

Matched pairs comparison of population means is the most useful analysis because the engines were tested using each of the two engine oils, so the engines are matched pairs.

A Researcher Is Investigating Which of Two Newly Developed Automobile