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the method of tree ring dating gave the following years AD for an archaeological excavation site....

the method of tree ring dating gave the following years AD for an archaeological excavation site. assume that the pooulation of x values has an approximately normal distribution. 1222,1285,1215,1222,1268,1316,1275,1317,1275 what is mean and sd. find 90% confidence interval for mean of all tree ring dates from this archaeological site

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