13. In order to see whether people are keeping their automobile tires inflated to the correct level (35 pounds per square inch, psi) a tire company manager selects a sample of 36 tires and checks the pressure. The mean of the sample is 33.5 psi, and the standard deviation is 3. Are the tires properly inflated? Use a = 0.10. Find the 90% confidence interval of the mean. Do the results agree? Explain.

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