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