GATE 2016 Textile Engineering: Confidence Interval Length Halved - Sample Size Question

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Textile Engineering > GATE 2016 > Probability and Statistics

If the length of a confidence interval on the mean of a normal distribution with known variance is to be halved, the sample size must

A

increase by 2 times

B

decrease by 2 times

C

increase by 4 times

D

decrease by 4 times

Correct : c

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