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 proportions.
B)Independent samples comparison of population proportions.
C)Independent samples comparison of population means.
D)Matched pairs comparison of population means.

Question

Quizplus · Accepted Answer

Since the same 20 engine types were tested with both engine oils, comparing the means of the hours of continuous use before breakdown for each oil type using a matched pairs approach is most appropriate. This method accounts for the variability among different engine types by effectively controlling for engine type as a variable.

A Researcher Is Investigating Which of Two Newly Developed Automobile