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Question 10 A manufacturer wishes to estimate the mean shelf life (in months) of a certain chemical. An estimate of the population standard deviation from

Question 10

A manufacturer wishes to estimate the mean shelf life (in months) of a certain chemical. An estimate of the population standard deviation from a previous sample was 12 months. If the manufacturer desires to be within 3 months of the true value with approximately 95% confidence, what total sample size will be required?

a) 8 b) 96 c) 62 d) 84 e) 76

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