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Mathematics, 11.02.2020 18:26 ndkjfgj4368

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. z = 1.645.
b. z = 1.96.
c. t value that depends on the sample sizes from the two populations.
d. z = 2.575.

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