Find the 95% confidence interval for the variance and standard deviation of the ounces of coffee

that a machine dispenses in 12-ounce cups. Assume the variable is normally distributed. The data is provided on the "Coffee" worksheet in the Excel workbook. values are:

Coffee in cup (oz.)

12.03

12.10

10.02

11.98

12.00

12.05

11.97

11.99