A shipping firm suspects that the mean life of a certain brand of tire used by its trucks is less than 37,000 miles. To check the claim, the firm randomly selects and tests 18 of these tires and gets a mean lifetime of 36,300 miles with a standard deviation of 1200 miles. Assume the distribution is normal. At α = 0.05, test the shipping firm's claim. Determine the p-value.
a) p-value < 0.05
b) p-value > 0.05
c) p-value = 0.05
d) p-value cannot be determined