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Scientists want to estimate the mean weight of mice after they have been fed a special...

Scientists want to estimate the mean weight of mice after they have been fed a special diet. From previous studies, it is known that the weight is normally distributed with standard deviation 3 grams. How many mice must be weighed so that a 99% confidence interval will have a margin of error of 0.5 gram?

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Answer #1

Given,

SD = 3

E = 0.50

For 99% confidence, z = 2.576

Hence,

Sample size required

n = 239

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