QOCH.C
The number of cell phones per 100 residents in countries in Europe is given in Table #1 for the year 2010. The number of cell phones per 100 residents in countries of the Americas is given in Table #2 also for the year 2010 ("Population reference bureau," 2013).
Table #1: Number of Cell Phones per 100 Residents in Europe
100
76
130
75
84
112
138
133
118
134
126
188
129
93
64
128
124
122
109
121
127
152
96
63
99
95
151
147
123
67
125
110
115
140
141
77
98
102
54
23
47
Table #2: Number of Cell Phones per 100 Residents in the Americas
158
117
106
159
53
50
78
66
88
92
42
3
150
72
86
113
58
70
37
32
85
101
69
55
73
157
119
81
87
105
Letμ1= mean number of cell phones per 100 residents in countries of Europe. Letμ2= mean number of cell phones per 100 residents in countries of the Americas. Find the 98% confidence interval for the difference in mean number of cell phones per 100 residents in Europe and the Americas.
(vii) Determine confidence interval estimate of the differenceμ1– μ2:
Enter lower bound value to nearest ten-thousandth, followed by < ,="" followed="">"μ1-μ2" for difference, followed by <, followed="" by="" upper="" bound="" value="" to="" nearest="" ten-thousandth. ="" no="" spaces="" between="" any="" characters.="" do="" not="" use="" italics,="" but="" if="" mathematically="" necessary="" use="" negative="" signs. ="" examples="" of="" correctly="" entered="">,>
0.0077<><>
13.1012<><>
-9.7300<><>
(viii) Using the confidence interval, select the most correct description of the result of the survey:
A. We estimate with 98% confidence that the sample mean number of cell phones per 100 residents in countries of Europe is anywhere from 4.3641 to 37.5276 more than the mean number of cell phones per 100 residents in countries of the Americas.
B. We estimate with 98% confidence that the true mean number of cell phones per 100 residents in countries of Europe is anywhere from 4.3641 to 37.5276 more than the mean number of cell phones per 100 residents in countries of the Americas.
C. We estimate with 98% confidence that the true proportion of cell phones per 100 residents in countries of Europe is anywhere from 4.3641 to 37.5276 more than the mean number of cell phones per 100 residents in countries of the Americas.
D. We estimate with 98% confidence that the mean number of cell phones per 100 residents in countries of Europe is anywhere from 4.3641 to 37.5276 less than the mean number of cell phones per 100 residents in countries of the Americas.
Enter letter corresponding to most correct answer
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