Posted by Anonymous on .
Suppose the method of tree ring dating gave the following dates A.D. for an archaeological excavation site.
1248 1187 1199 1236 1206 1241 1185 1288 1239
Find an 80% confidence interval for the mean of all tree ring dates from this archaeological site.

statistics 
MathGuru,
You will have to find mean and standard deviation for the data given. Once you have those values, use a confidence interval formula to determine the interval. Your sample size is 9.