Critical value cannot be determined without knowing margin

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Reference no: EM13756651

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.

Reference no: EM13756651

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