Question: A cell phone service provider has selected a random sample of 20 of its customers in an effort to estimate the mean number of minutes

A cell 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:

the critical value is t=2.093

the critical value is z=1.645

the critical value is z=1.96

The critical value can't be determined without knowing the margin of error.

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