How large a sample should be selected to provide a 95% confidence interval with a margin of error of 10? Assume that the population standard deviation is 40. Round your answer to next whole number.
Ans:
Given that
Population standard deviation=40
Margin of error=10
z=1.96 for 95 % confidence level
Sample size required,
n=(1.96*40/10)^2
n=61.5
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