Question

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

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.


1,2781,2501,2991,2921,2681,3161,2751,3171,275


(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.)

x

= A.D.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.)

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

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