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1) The following are scores on special tests of a random sample of 18 students. Find a 95 percent confidence interval estimate of the average

1) The following are scores on special tests of a random sample of 18 students. Find a 95 percent confidence interval estimate of the average test score of all students, 131 120 121 142 136 125 121 155 140 132 127 120 151 134 123 137 130 140

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