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

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Basic Math

The method of tree ring dating gave the following years A.D. foran archaeological excavation site. Assume that the population ofx values has an approximately normal distribution.

127811871222126412681316127513171275

(a) Use a calculator with mean and standard deviation keys tofind the sample mean year x and sample standard deviations. (Round your answers to the nearest whole number.)

x =A.D.
s =yr


(b) Find a 90% confidence interval for the mean of all tree ringdates from this archaeological site. (Round your answers to thenearest whole number.)

lower limit    A.D.
upper limit    A.D.

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