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K M Q R S Number pf Cell Phones per 100 Residents The number of cell phones per 100 residents in countries in Europe is given in Europe America table #9.3.9 for the year 2010. The number of cell phones per 100 residents in 100 158 countries of the Americas is given in table #9.3.10 also for the year or 112 78 2010 ("Population reference bureau," 2013). Is there enough evidence to id show that the 126 150 mean number of cell phones in countries of Europe is more than in countries of the Americas? Test at the 1% level. 124 70 96 75 Step 1 Identify variable and parameter with variable and words 123 86 X1 = 110 87 X 2= 98 117 H1 = 54 66 H2 = 76 72 84 109 188 39 Step 2 Identify Null Hypothesis, Alternative Hypothesis, (words and algebraically) and Level of Significance 122 157 63 105 HO : 95 106 Ha : 115 88 a = 102 86 23 37 Step 3 Check for normality 100 55 138 100 129 96 109 159 Can you be confident about your decision? 99 92 67 113 Step 4 Find sample statistic, test statistic and pvalue, Draw a picture 115 32 X1 - X2 = T = 112 115 126 119 SE = PV = 75 53 118 42 64 50 127 82 151 95 118 81 141 50 118 3 47 58 84 101 134 73 128 113 -3 -2 -1 0 1 2 3 152 147 125 77 Step 5 Make a conclusion about null hypothesis 118 Step 6 Interpret you alternative hypothesis