d) Use statistical software to construct a 99% confidence interval for the mean monthly cell phone bill.
85.57
145.09
87.58
69.77
134.12
30.08
93.00
153.56
54.77
150.00
99.50
149.83
0.00
145.80
66.00
53.20
49.78
69.90
150.30
106.83
56.59
0.00
167.34
54.95
182.00
99.37
14.95
150.34
54.84
100.45
34.99
78.88
60.00
89.22
109.05
82.83
79.85
52.65
102.99
78.76
80.00
100.13
187.04
66.80
50.24
90.31
103.19
204.94
19.92
45.18
50.00
59.86
199.55
134.86
30.10
31.89
67.55
188.57
0.00
29.96
44.95
104.06
70.00
79.92
65.20
166.11
59.95
98.46
250.33
169.34
70.17
79.15
9.99
110.91
54.76
51.00
50.17
50.13
74.88
100.28
60.00
74.99
42.06
29.93
200.58
81.00
19.91
430.13
110.46
35.81
101.00
164.58
130.44
150.16
112.47
149.88
24.97
99.78
107.00
369.21
The statistical software output for this problem is :
The 99% C. I. is:
(77.6098 , 113.1691)
d) Use statistical software to construct a 99% confidence interval for the mean monthly cell phone...