A manufacturer of motor oil is interested in testing the effects of a newly developed additive on the lifespan of an engine. Twenty-five different engine types are selected at random and each one is tested using oil with the additive and oil without the additive. What type of analysis will yield the most useful information?
A.
Matched pairs comparison of population proportions
B.
Matched pairs comparison of population means
C.
Independent samples comparison of population proportions
D.
Independent samples comparison of population means
E.
Chi-square test of homogeneity
Exam No：AP Statistics Problem Set 10 Year：2024 Question No：39
Answer:
B
Knowledge points:
7.6 Confidence Intervals for the Difference of Two Means
7.8 Setting Up a Test for the Difference of Two Population Means
Solution:
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