An auto manufacturer claims that its new 4-cylinder Hybrid auto with manual shift averages 50 mpg under city driving conditions. A Federal Agency believes this claim is too high and decides to...

Extracted text: An auto manufacturer claims that its new 4-cylinder Hybrid auto with manual shift averages 50 mpg under city driving conditions. A Federal Agency believes this claim is too high and decides to randomly test 25 of the manufacturer's 4-cylinder Hybrid autos with manual shift. The Agency determines the mean average mpg for the sample to be 48 with a sample standard deviation of 4 mpg under city driving conditions. The decision rule for this hypothesis test at a = 5% is: a. Reject Ho if the test statistic is greater than 1.65. D. Reject Ho if the test statistic is less than -1.96 or greater than 1.96. C. Reject Ho if the test statistic is less than -1.65. d. Reject Ho if the test statistic is less than -2.33. e. Reject Ho if the test statistic is less than -1.71.