Randomly selected 13
student cars have ages with a mean of 7.5
years and a standard deviation of 3.4
years, while randomly selected 13
faculty cars have ages with a mean of 5.1
years and a standard deviation of 3.3
years.
1. Use a 0.01
significance level to test the claim that student cars are older than faculty cars.
(a) The test statistic is
equation editorEquation Editor
(b) The critical value is
equation editorEquation Editor
(c) Is there sufficient evidence to support the claim that student cars are older than faculty cars?
A. Yes
B. No
2. Construct a 99
% confidence interval estimate of the difference μs−μf
, where μs
is the mean age of student cars and μf
is the mean age of faculty cars.
equation editorEquation Editor <(μs−μf)<
equation editorEquation Editor
