Supposing that a computer has been employed to calculate a P-value = 0.01635, what can we conclude regarding the following situation? A simple random sample of 50 speeds (in mph) is obtained from cars traveling on the section of I-10 through Tallahassee. The sample has a mean of 72.3 mph and standard deviation of 7.4 mph. Employ a 0.05 significance level to test the claim that the mean speed of all cars is greater than the posted speed limit of 70 mph.
a. There is sufficient evidence to support the claim that mean speed of all cars on that section of I-10 is greater than the posted speed limit of 70 mph.
b. There is insufficient evidence to support claim that the mean speed of all cars on that section of I-10 is greater than the posted speed limit of 70 mph.
c. We can't conclude anything without knowing the population size.
d. We are 50% confident that drivers exceed the speed limit.