Stratify the data according to marital status and gender, and sample 20 individuals. Compute the mean of the sample variable selected in Exercise 1 (use four groups of five individuals).

Data from in Exercise 1

From the Data Bank, choose a variable. Select a random sample of 20 individuals, and find the mean of the data.

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Data Bank ID number Age 01 27 2 1 02 18 1 03 32 2 04 24 2 05 19 1 06 56 07 65 1 1 2 1 47 1 08 36 11 8 09 10 1 12 13 14 285 43 48 3 2 0 37 2 Educational level Smoking status 63 1 0 1 0 0 0 1 2 0 0 0 2 0 1 0 1 1 2 3 Exercise 0 1 1 2 1 0 0 3 Weight Serum cholesterol 120 193 145 118 162 106 143 160 215 127 132 196 109 170 187 Systolic pressure 196 208 188 206 240 215 201 215 Sodium 199 148 210 115 242 149 193 142 Gender 126 F 118 136 105 210 120 137 M S 128 115 135 F M 129 108 142 M M 119 106 133 F S 136 111 138 F W 131 99 140 M W 163 106 151 132 111 134 138 109 135 115 146 M 114 141 F 101 152 F D 109 144 M M M F F M 3 Marital status D M D D S