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In developing a confidence interval estimate for the difference between two population means when ...

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In developing a confidence interval estimate for the difference between two population means when ...

In developing a confidence interval estimate for the difference between two population means when the population variances are known, a decrease in the difference\(\style{font-family:Times New Roman;}{{\overline x}_1-{\overline x}_2}\)will result in:

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a wider confidence interval.

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a narrower confidence interval.

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a smallerzcritical value.

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the same confidence interval of the same width.

Textbook

Introductory Statistics: A Problem-Solving Approach

Edition: 3^rd

Author: Kokoska

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