n a study of exhaust emissions from school buses, the pollution intake by passengers was determined for a sample of nine school buses used in the a school district. The pollution intake is the amount of exhaust emissions, in grams per person, that would be breathed in while travelling on the bus during its usual 10-mile trip on congested highways. Here are the amounts for the nine buses when driven with the windows open:    1.15       0.33       0.40       0.33       1.35       0.38       0.25       0.40       0.35    The data can be accessed HERE. Find a 90% confidence interval to estimate the population mean pollution intake μμ by completing the following. The sample mean x¯=x¯=   The standard error SE=SE=   The tt-critical value t∗=t∗=   Lower end of the confidence interval L=L=   Upper end of the confidence interval U=U=   What is the margin of error?  ME=ME=

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