The method of tree ring dating gave the following years A.D. for an

archaeological excavation site. Assume that the population of x values has an approximately normal distribution.
1292,1194,1313,1201,1268,1316,1275,1317,1275
(a) Use a calculator with mean and standard deviation keys to find the sample mean year x and sample standard deviation s. (Round your answers to the nearest whole number.)
a:x = A.D.
b: s = yr
(b) Find a 90% confidence interval for the mean of all tree ring dates from this archaeological site. (Round your answers to the nearest whole number.)
a:lower limit=     A.D.
b:upper limit=     A.D.

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