WILL GIVE MEDAL FOR HELP!!
The number of candy pieces in a bag is calculated for a sample of 40 bags of a particular manufacture. Based on this data, the sample mean is 28.2 pieces. The population standard deviation is to be 3.9 (remember this is the unrealistic part, we would not really know this). Which below is a 95% confidence interval for the mean number of pieces of candy per bag? Note: 95% of all possible confidence intervals for a sample size of 30 will contain the population mean. Use 1.960 for a 95% CI and 2.576 for a 99% CI

(26.99,29.41)
(24.31,32.09)
(20.17,36.23)
(26.24,30.

Question

WILL GIVE MEDAL FOR HELP!!
The number of candy pieces in a bag is calculated for a sample of 40 bags of a particular manufacture. Based on this data, the sample mean is 28.2 pieces. The population standard deviation is to be 3.9 (remember this is the unrealistic part, we would not really know this). Which below is a 95% confidence interval for the mean number of pieces of candy per bag? Note: 95% of all possible confidence intervals for a sample size of 30 will contain the population mean. Use 1.960 for a 95% CI and 2.576 for a 99% CI

(26.99,29.41)
(24.31,32.09)
(20.17,36.23)
(26.24,30.

anonymous · Answer

@amistre64

anonymous · Answer

The last number on answer D is 30.16 sorry...

anonymous · Answer

I know that Confidence interval = sample statistic + Margin of error

anonymous · Answer

@kropot72

anonymous · Answer

Sorry, I had problem with my computer, It closed my last question. I can see some of what you were saying there.

kropot72 · Answer

@bookworm1156 Can you see my postings here. http://openstudy.com/study#/updates/5550f97fe4b08562d83d656b