Question 8 (1 point) Question 8 options: The number of cell phones per 100 residents in countries
Question:
Question 8 (1 point)
Question 8 options:
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
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
123
95
67
67
118
125
110
115
140
115
141
77
98
102
102
112
118
118
54
23
121
126
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
50
58
70
109
37
32
85
101
75
69
55
115
95
73
86
157
100
119
81
113
87
105
96
Let 1= mean number of cell phones per 100 residents in countries of Europe.Let 2 = 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.
(i)Forthesamplefrompopulationwithmean=1:Determinesamplemeanx1andsamplestandarddeviations1
Enter sample mean in decimal form to nearest ten-thousandth, then comma, then sample standard deviation in decimal form to nearest ten-thousandth.Examples of correctly entered answers:
13.2027,2.3471
0.2700,0.0006
-10.3150,0.0790
(ii)Forthesamplefromthepopulationwithmean=2:Determinesamplemeanx2andsamplestandarddeviations2
Enter sample mean in decimal form to nearest ten-thousandth, then comma, then sample standard deviation in decimal form to nearest ten-thousandth.Examples of correctly entered answers:
13.2027,2.3471
0.2700,0.0006
-10.3150,0.0790
(iii)Enter the level of significance used for this interval estimate:
Enter in decimal form.Examples of correctly entered answers:0.010.020.050.10
(iv)Determine degrees of freedom df :
Enter value rounded DOWN to nearest integer.
(v)Determine t - score associated with critical value:tc
Enter in decimal form to nearest thousandth.Examples of correctly entered answers:
0.00110.0200.5000.3712.000
(vi)Determine "error bound of the mean"E
Enter value in decimal form rounded to nearest thousandth.Examples of correctly entered answers:
2.0143.07016.000110.019
(vii) Determine confidence interval estimate of the difference 1 - 2 :
Enter lower bound value to nearest ten-thousandth, followed by < , followed by "1-2" 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 answers:
0.0077<1-2<0.0780
13.1012<1-2<18.3941
-9.7300<1-2<-3.0008
(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
Expert Answer:
