To see whether people are keeping their car tires inflated to the correct level (35 psi), a tire company employee selects a sample of 36 tires (randomly) and checks their pressure.The mean of the sample is 33.5 psi with a standard deviation of 3 psi. Are the tires properly inflated? Use = 0.10. Find the 90% confidence interval for the mean. Do the results agree - explain.