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If the population variances are assumed to be known in an

If the population variances are assumed to be known in an application where a manager wishes to estimate the difference between two population means, the 95 percent confidence interval estimate can be developed using which of the following critical values?

a) t value that depends on the sample sizes from the two populations

b) z = 2.575

c) z = 1.645

d) z = 1.96

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Basic Statistics: If the population variances are assumed to be known in an

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