Question

The following data represent a sample of the assets (in millions of dollars) of 30 credit unions in southwestern Pennsylvania. Find the 90% confidence interval of the mean.

12.23

16.56

4.39

2.89

1.24

2.17

13.19

9.16

1.42

73.25

1.91

14.64

11.59

6.69

1.06

8.74

3.17

18.13

7.92

4.78

16.85

40.22

2.42

21.58

5.01

1.47

12.24

2.27

12.77

2.76

Answer 1

90%	confidence level
11.09066667	mean
14.40544747	std. dev.
30	n
1.645	z
4.3261	margin of error
6.7646	lower confidence limit
15.4167	upper confidence limit

The 90% confidence interval is:

(6.7646,15.4167)

............................................................

The given data is:

12.23
16.56
4.39
2.89
1.24
2.17
13.19
9.16
1.42
73.25
1.91
14.64
11.59
6.69
1.06
8.74
3.17
18.13
7.92
4.78
16.85
40.22
2.42
21.58
5.01
1.47
12.24
2.27
12.77
2.76