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102 QUESTIONS 6- 11 ARE RELATED TO THE FOLLOWING 103 Now consider the textbook expense of all IUPUI students. The mean and variance of textbook 104 expense of all IUPUI students are as follows: 105 1 = $518.66 106 42 - 15965.1 107 108 From the population of IUPUI students you take repeated samples of size 109 n - 92 110 and compute the sample mean textbook expense. 111 6 The standard error of the x is 112 a 9.60 113 b 10.67 114 C 11.86 115 d 13.17 116 117 7 The fraction of sample means below $500 is 118 a 0.1112 119 b 0.0783 120 C 0.0552 121 d 0.0388 122 123 8 The fraction of sample means that fall within $15 124 0.7452 from the population mean is 125 0.7030 126 0.6632 127 d 0.6257 128 129 9 The margin of error for the middle interval which captures 95% of the means from 130 samples of size n = 92 is, 131 a 20.45 132 b 22.98 133 C 25.82 134 d 29.01 135 136 10 The middle interval that captures 95% of the means from sample of size n = 92 is, 137 a 492.84 544.48 138 b 488.54 548.78 139 484.23 553.09 140 d 479.93 557.39 142 11 To obtain a margin of error of +$20 for the interval that captures 95% of the sample 143 means, the minimum sample size is 144 a 266 145 222 146 185 147 154 148 149 NEXT TWO QUESTIONS ARE RELATED 151 150 12 A researcher reports survey results by stating that the margin of error for the 95% 152 middle interval of the sample means is 44.75. The population variance is assumed to be 63 = 18750. The sample size used in this survey is_ 153 a 53 154 b 44 155 36 156 31 157 158 13 159 In the previous question the margin of error for the middle interval that captures 90%% of sample means is 160 a 49.96 161 b 45.42 162 C 41.29 63 d 37.54 264