A car manufacturer, Swanson, claims that the mean lifetime of one of its car engines is

greater than 220,001 miles, which is the mean lifetime of the engine of a competitor. The

mean lifetime for a random sample of 23 of the Swanson engines was x = 226,450 miles

with a standard deviation, s, of 11,502 miles. Test the Swanson's claim using a significance

level of = 0.02.

A.P-value = 0.02670 < 0.05, reject the null hypothesis. There is enough evidence to conclude that the mean lifetime of this car engine is greater than 220,001 miles.

B.P-value = 0.00670 < 0.02, reject the null hypothesis. There is enough evidence to conclude that the mean lifetime of this car engine is greater than 220,001 miles.

C.P-value = 0.01341 < 0.05, reject the null hypothesis. There is enough evidence to conclude that the mean lifetime of this car engine is greater than 220,001 miles.

D.P-value = 0.00431 < 0.01, reject the null hypothesis. There is enough evidence to conclude that the mean lifetime of this car engine is greater than 220,001 miles.