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A researcher is unsatisfied with her confidence interval in a study. She would like to have...

  1. A researcher is unsatisfied with her confidence interval in a study. She would like to have a shorter confidence. What suggestions can you give her to shorten the confidence interval?
Math   Statistics-And-Probability   
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Answer #1

Confidence interval is given by the formula CI = Z*

Z* is the confidence level of the study. If she is calculating 99% confidence level, she can lower it to 95% or 90% to decrease then Z* value and hence decrease the confidence interval. But the best possible option is increasing the sample size n. The sample size is in the hands of the researcher to be determined. If the researcher take more samples, the standard error will come down, thereby shortening the confidence interval.

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