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A 99 confidence interval for the mean of a normal

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Reference no: EM13619240

A 99% confidence interval for the mean of a normal population when the standard deviation ? is known is found to be 98.6 to 118.4. If the confidence level is reduced to .95, the confidence interval for ?

(Explain why too please)

a.) becomes wider

b.) remains unchanged

c.) becomes zero

d.) becomes narrower

Reference no: EM13619240

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