An estimate is needed of the mean acreage of farms in Region X. The estimate should be
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An estimate is needed of the mean acreage of farms in Region X. The estimate should be correct to within 100 acres with probability 0.95.
A preliminary study suggests that 400 acres is a reasonable guess for the standard deviation of farm size.
(a) How large a sample of farms is required?
(b) A random sample is selected of the size found in (a).
The sample has a standard deviation of 800 acres, rather than 400.What is the margin of error for a 95% confidence interval for the mean farm size?
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Related Book For 
Statistical Methods For The Social Sciences
ISBN: 9781292220314
5th Global Edition
Authors: Alan Agresti
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