Question

1) The monthly incomes for 12 randomly selected​ people, each with a​ bachelor's degree in​ economics, are shown on the right. Complete parts​ (a) through​ (c) below.

4450.95
4596.38
4366.17
4455.36
4151.35
3727.41
4283.63
4527.76
4407.16
3946.67
4023.08
4221.36

2) Use the standard normal distribution or the​ t-distribution to construct a 99​% confidence interval for the population mean. Justify your decision. If neither distribution can be​ used, explain why. Interpret the results.

In a random sample of 11 mortgage​ institutions, the mean interest rate was 3.48% and the standard deviation was 0.48​%. Assume the interest rates are normally distributed.

The 99% confidence interval is (__,__)

3) Use the standard normal distribution or the​ t-distribution to construct a 95​% confidence interval for the population mean.Justify your decision. If neither distribution can be​ used, explain why. Interpret the results. In a random sample of 41 people, the mean body mass index (BMI) was 29.5 and the standard deviation was 6.09.

Answer 1

Its confidence interval problem.pl?☺️