survey of 31 randomly selected students finds that they save a mean of $82 per semester by
using a website. Assume the date comes from a normal distribution and the sample standard deviation is $18 per month.
Confidence Interval: What is the 99% confidence interval to estimate the population mean? (Round your
answers to two decimal places.)
____< u < _____
The critical value for and degrees of freedom is
The corresponding confidence interval is computed as shown below:
Therefore, based on the data provided, the 99% confidence interval for the population mean is which indicates that we are 99% confident that the true population mean is contained by the interval
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