An automaker is interested in information about how long transmissions last. A sample of transmissions is run constantly and the number of miles before the transmission fails is recorded. The automaker claims that the transmissions can constantly run for over 150,000 miles before failure. The results of the sample are given below.

Mean 150.7

Variance 4.661

Observations 46

Hypothesized Mean 150

df 45

t Stat 2.185

P(T<=t) one-tail 0.017

t Critical one-tail 1.679

P(T

t Critical two-tail 2.014

Confidence level (95%) 0.641