A 100(1 – a)% confidence interval for the mean u of a normal population when the value of o is known is given by Za/2 By how much must the sample size n be increased if the width of the CI above is to be halved? Halving the length requires n to be increased by a factor of | If the sample size is increased by a factor of 49, what effect will this have on the width of the interval? Increasing the sample size by a factor of 49 wil -Select- v the length by a factor of | -Select- Need Help? Read It increase decrease

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