Question: 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:

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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