The General Electric Service Department Believes That the Median Time

Multiple Choice

The General Electric service department believes that the median time for a service call should be 30 or fewer minutes.To test this,the following random sample of service times was collected: Given that the managers do not wish to make the assumption that the population is normally distributed,the appropriate statistical test for testing about service times is:

A) the t-test.
B) the Kruskal-Wallis test.
C) the Wilcoxon signed rank sum test.
D) the F-test.