Homework Answers
1. 99% confidence interval for population mean is
n= 16
For 99% confidence , zc = 2.58
Thus , 99% confidence interval for population mean is
= (14.81 , 15.19)
Blank 1 : (14.81 , 15.19)
2. For 95% confidence , zc = 1.96
Thus , 95% confidence interval for population mean is
= (14.85 , 15.15)
Blank 2 : (14.85 , 15.15)
3. The 99% CI from a sample of 16 is wider than 95% CI from a sample of size 16 .
Blank 3 : Wider
4. If the population is not normal , then we can construct confidence interval using t distribution, if sample size is large. But as sample size is very small ( <30) , we cannot construct CI .
Blank 4: Neither
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