Suppose a 95% confidence interval for µ turns out to be (1,000, 2,100). To make more
useful inferences from the data, it is desired to reduce the width of the confidence
interval. Which of the following will result in a reduced interval width?
A. Increase the sample size.
B. Decrease the confidence level.
C. Both increase the sample size and decrease the confidence level.
D. Both increase the confidence level and decrease the sample size.
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