Sample size
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A previous study of nickels showed that the standard deviation of the weight of nickels is 250 miligrams. A coin counter manufacturer wishes to find the 90% confidence interval for the average weight of a nickel. How many nickels does he need to weigh to be accurate within 15 miligrams?
a. 457
b. 278
c. 752
d. 1068
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This solution gives the step by step method for computing sample size .
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