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

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 size of the sample drawn to decrease the width of the interval?

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