Mathematics, 26.09.2019 15:30 rbgrh5779

Acell phone service provider has selected a random sample of 20 of its customers in an effort to estimate the mean number of minutes used per day. the results of the sample included a sample mean of 34.5 minutes and a sample standard deviation equal to 11.5 minutes. based on this information, and using a 95 percent confidence level:

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