If the Population Variances Are Assumed to Be Known in an Application

question 113

Multiple Choice

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 90 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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