alpha,standard_dev,size!Returns the confidence interval for a population mean!is the significance level used to compute the ...

!alpha,standard_dev,size!!Returns the confidence interval for a population mean!is the significance level used to compute the confidence level, a number greater than 0 and less than 1!is the population standard deviation for the data range and is assumed to be known. Standard_dev must be greater than 0!is the sample size!