Which type of test is used in the following scenario:

A manufacturer claims that the mean lifetime of a new cutting bladeis 2 years. Fourteen bladesare randomly selected and their lifetime is measured. Assume thepopulationfollows anormal distributions with known standard deviation.

Select the correct answer below:

A. The test is right-tailed because the alternative hypothesis isHa:>2.

B. The test is left-tailed because the alternative hypothesis isHa:<2

C. The test is right-tailed because the alternative hypothesis isHa:<2

D. The test is left-tailed because the alternative hypothesis isHa:>2

E. The test is two-tailed because the alternative hypothesis isHa:2