Problem#25. Confidence Interval for a Population Mean
A university is conducting research on the monthly utility (phone, internet, electricity, gas, …) expenses incurred by its students who live off campus. Data was collected from 180 students. See the accompanying data.
a) Use the data to construct a 90% confidence interval for the population mean monthly utility expense of students who live off campus.
b) Interpret the confidence interval obtained in part a.
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