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4. Suppose you are interested in the effect of an experimental drug on blood pressure. Blood pressures in mmHg are measured before and after treatment

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4. Suppose you are interested in the effect of an experimental drug on blood pressure. Blood pressures in mmHg are measured before and after treatment from a random sample of 15 participants. The following data result: Subject 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Pre 134 106 110 115 122 126 130 118 125 110 138 111 115 125 130 Post 130 103 116 113 124 122 128 124 123 108 134 108 111 129 134 To save time, you can copy the following data into R: x1

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