A consumer analyst reports that the mean life of a certain type of

A consumer analyst reports that the mean life of a certain type of automobile battery is not 74 months

Ho: mean life is 74 months (i.e. Ho:µ = 74) and Ha: Mean life is not 74 months (i.e. Ha: µ≠74)

•Find the test statistic.

•Find the p-value

•Decide whether to reject the null hypothesis.

 

•Interpret the decision in the context of the original claim.