A pipes manufacturer makes pipes with a length that is supposed to be 10

inches. A quality control technician sampled 30

pipes and found that the sample mean length was 10.08

inches and the sample standard deviation was 0.16

inches. The technician claims that the mean pipe length is not 10

inches.

What type of hypothesis test should be performed?

What is the test statistic?

Does sufficient evidence exist at the =0.05 significance level to support the technician's claim?