Question: 2.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

2.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 and has control over two factors of the interval test. How can the researcher adjust/change the following two factors to decrease the width of the interval?

a.The confidence level of the interval.

b.The size of the sample drawn.

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