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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.

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    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.

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