AIR MATH

Math Question

In a random sample of 8 people, the mean commute time to work was \( 34.5 \) minutes and the standard deviation was \( 7.2 \) minutes. A \( 95 \% \) confidence interval using the t-distribution was calculated to be \( (28.5,40.5) \). After researching commute times to work, it was found that the population standard deviation is \( 9.3 \) minutes. Find the margin of error and construct a \( 95 \% \) confidence interval using the standard normal distribution with the appropriate calculations for a standard deviation that is known. Compare the results. The margin of error of \( \mu \) is (Round to two decimal places as needed.)

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