a 95% confidence interval for the mean of a population is to be constructed and must be accurate to within 0.3 unit. a preliminary sample standard deviation is 3.9. the smallest sample size n that provides the desired accuracy is a) 650 b) 639 c) 656 d) 653 e) 640 f) none of the above

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02-11-2022
Mathematics

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a 95% confidence interval for the mean of a population is to be constructed and must be accurate to within 0.3 unit. a preliminary sample standard deviation is 3.9. the smallest sample size n that provides the desired accuracy is a) 650 b) 639 c) 656 d) 653 e) 640 f) none of the above

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