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A 95% confidence interval, based on a sample of size 75 , was found to be(19.42,31.45) . A researcher would like the interval width to

A 95% confidence interval, based on a sample of size 75 , was found to be(19.42,31.45) . A researcher would like the interval width to be smaller.

How can the researcher adjust/change the confidence level of the interval to decrease the width of the interval?

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