A recent survey of 8 randomly selected social networking sites has a mean of 13.1 million visitors for a specific month. The standard deviation is 4.1 million. Find the 95% confidence interval of the true mean.

95 percent times 13. 1000000. 13.1000000 take away the answer. That will be answer for the specific month. 95 percent times 4.100000. 4.1000000 take away the answer gives you the answer for the standard deviation. You plus them altogether to find the confidence interval of the true mean.