The number of cell phones per 30 residents in countries in Europe is given in table C for the year 2010. The number of cell phones per 30 residents in countries of the Americas is given in table D also for the year 2010. Find the 90% confidence interval for the different in mean number of cell phones per 30 residents in Europe and the Americas.
Table C: Number of Cell Phones per 30 Residents in Europe
100 |
76 |
100 |
130 |
75 |
84 |
112 |
84 |
138 |
133 |
118 |
134 |
126 |
188 |
129 |
93 |
64 |
128 |
124 |
122 |
109 |
121 |
127 |
152 |
96 |
63 |
99 |
95 |
151 |
147 |
Table D: Number of Cell Phones per 30 Residents in the Americas
158 |
117 |
106 |
159 |
53 |
50 |
78 |
66 |
88 |
92 |
42 |
3 |
150 |
72 |
86 |
113 |
50 |
58 |
70 |
109 |
37 |
32 |
85 |
101 |
75 |
69 |
55 |
115 |
95 |
73 |
The 90% CI for the mean difference is (18.08, 45.98)
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