You randomly select and measure the contents of 10 bottles of cough syrup. The results are shown 4.219 4.292 4.257 4.247 4.188 4.297 4.266 4.247...

You randomly select and measure the contents of 10 bottles of cough syrup. ... The results are shown 4.219 4.292 4.257 4.247 4.188 4.297 4.266 4.247 4.227 4.231 Assume the sample is taken from a normally distributed population. Construct 80% confidence intervals for (a) the population variance 2 and (b) the population standard deviation