10.140 The same achievement test is given to soldiers selected at random from two units. The scores...

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10.140 The same achievement test is given to soldiers selected at random from two units. The scores they attained are summarized as follows:

Unit 1: n1  70, x1  73.2, s1  6.1 Unit 2: n2  60, x2  70.5, s2  5.5 Construct a 90% confidence interval for the difference in the mean level of the two units.

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