QUESTION 12
"If you wish to decrease the width of a confidence interval, you may do which one of the following: "
Reduce sample size. |
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Reduce the size of the population. |
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Decrease the level of confidence. |
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Both b and c |
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.
QUESTION 12 "If you wish to decrease the width of a confidence interval, you may do...
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