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QUESTION 12 "If you wish to decrease the width of a confidence interval, you may do...

QUESTION 12

  1. "If you wish to decrease the width of a confidence interval, you may do which one of the following: "

    Reduce sample size.

    Reduce the size of the population.

    Decrease the level of confidence.

    Both b and c

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Answer #1

Ans: Decrease the level of confidence

Confidence interval CI = z*

As the confidence level increase, the critical value (z*) increase and thereby the confidence interval will get widened. Reducing sample size (n) increases the width of confidence interval. The population size have no impact on confidence interval.

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