The number of hours of reserve capacity of 10 randomly selected automotive batteries is shown to the right. 1.77 1.87 1.55 1.62 1.77 1.96 1.31 1.57 1.49 2.04 assume the sample is taken from a normally distributed population. construct 98​% confidence intervals for​ (a) the population variance sigmasquared and​ (b) the population standard deviation sigma.