1. You randomly select and measure the contents of 10 bottles of cough syrup. The results (in fluid ounces) are shown.
4.212
4.297
4.251
4.242
4.188
4.292
4.261
4.241
4.226
4.238
Assume the sample is taken from a normally distributed population. Construct 99% confidence intervals for (a) the population variance sigmasquared and (b) the population standard deviation sigma.
(a) The confidence interval for the population variance is (?,?)
(Round to six decimal places as needed.)
(b) The confidence interval for the population standard deviation is (?,?)
(Round to four decimal places as needed.)

2. The number of hours of reserve capacity of 10 randomly selected automotive batteries is shown.
1.77
1.82
1.59
1.65
1.78

1.95
1.32
1.52
1.41
2.01
Assume the sample is taken from a normally distributed population. Construct 95% confidence intervals for (a) the population variance sigmasquared and (b) the population standard deviation sigma.
(a) The confidence interval for the population variance is (?,?)
(Round to three decimal places as needed.)
(b) The confidence interval for the population standard deviation is (?,?)
(Round to three decimal places as needed.)

3. The monthly incomes of 14 randomly selected individuals who have recently graduated with a bachelor's degree in economics have a sample standard deviation of $ 341. Construct a confidence interval for the population variance sigma squared and the population standard deviation sigma. Use a 95 % level of confidence. Assume the sample is from a normally distributed population.

What is the confidence interval for the population variance sigma squared?
(?,?)
(Round to the nearest integer as needed.)
What is the confidence interval for the population standard deviation sigma?
(?,?)
(Round to the nearest integer as needed.)

need these 3 in under 40 min please