We want to compare the mean salaries of elementary school teachers in Edmonton and Calgary. Based on the data he collected, we computed the following statistics in Table 1. Edmonton Calgary sample mean x1 = 45000 x2 = 53000 sample standard deviation s1 = 2400 s2 = 1150 sample size n1 = 400 n2 = 600 Table 1: Summary of the salaries of elementary school teachers in Edmonton and Calgary Let 1 = the mean salary of elementary school teachers in Edmonton 2 = the mean salary of elementary school teachers in Calgary: 26. A 90% condence interval for the dierence of the mean salaries of elementary school teachers in Edmonton and Calgary (1 ? 2) is (a) from -8253.333 to -7746.667 (b) from -8212.485 to -7787.515 (c) from -8165.453 to -7834.547 (d) from -8212.099 to -7787.901 (e) from -8165.195 to -7834.805
We want to compare the mean salaries of elementary school teachers in Edmonton and Calgary. Based on the data he collected, we computed the following statistics in Table 1. Edmonton Calgary sample mean x1 = 45000 x2 = 53000 sample standard deviation s1 = 2400 s2 = 1150 sample size n1 = 400 n2 = 600 Table 1: Summary of the salaries of elementary school teachers in Edmonton and Calgary Let 1 = the mean salary of elementary school teachers in Edmonton 2 = the mean salary of elementary school teachers in Calgary: 26. A 90% condence interval for the dierence of the mean salaries of elementary school teachers in Edmonton and Calgary (1 ? 2) is (a) from -8253.333 to -7746.667 (b) from -8212.485 to -7787.515 (c) from -8165.453 to -7834.547 (d) from -8212.099 to -7787.901 (e) from -8165.195 to -7834.805
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