STATDISK has the ability to construct a confidence interval estimate for the mean. The next question is designed to introduce you to this functions within STATDISK. For more information, please review the following tutorial. Always feel free to pause and/or restart the video.

A sample of 92 items resulted in sample mean of 2.5 and a sample standard deviations of 9.6. Assume that the population standard deviation is known to be 7. Construct a 91.57% confidence interval estimate for the population mean.

Enter the lower bound of the confidence interval. (Round to the nearest thousandth.)