Question

The sample mean number of accidents is to be calculated for both a sample of male and a sample of female drivers and we wish to determine the difference in sample means.

Which statistic is being studied?
A. x-bar
B. d-bar
C. x-bar1 - x-bar2
D. mean1 - mean2

Answer 1

C. x-bar1 - x-bar2

Explanation:

Estimators represent sample characteristics that gives informaton about the parameters which are the population characteristics. In this case, the estimator of the mean parameter is x-bar. Because the study is trying to determine the difference in sample means, then the statistic that should be used is x-bar1-xbar2.