A simple random sample of size 64 is drawn from a normal population with a known...
A simple random sample of size 64 is drawn from a normal population with a known standard deviation σ. The 95% confidence interval for the population mean μ is found to be (12, 16). The approximate population standard deviation σ is:
Homework Answers
Margin of error = Width of confidence interval / 2
= ( 16 - 12) / 2
= 2
Margin of error = Z
/2
* 
/ sqrt(n)
2 = 1.96 *
/ sqrt( 64)
= 0.49
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