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A 100(1 − α)% confidence interval for the mean μ of a normal population when the value of σ is known is given by x − zα/2 · σ n , x + zα/2 · σ n . 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 25
Answers: 3
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A 100(1 − α)% confidence interval for the mean μ of a normal population when the value of σ is known...
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