Sample data from a normal population are located in the Microsoft Excel Online file below. Use the data to answer the following questions for the $\backslash$sigma unknown case. Open spreadsheet The point estimate of the population mean is $($to $2$ decimals$)11\mathrm{.}12$ The standard deviation is $($to $2$ decimals$)5\mathrm{.}13$ The margin of error is $($to $1$ decimal$)$ The $95\%$ confidence interval is $($to $1$ decimal$)0\mathrm{.}95$ to