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he 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
he method of tree-ring dating gave the following years A.D. for an archaeological excavation site. Assume that the population ofxvalues has an approximately normal distribution.
1,292 | 1,243 | 1,299 | 1,201 | 1,268 | 1,316 | 1,275 | 1,317 | 1,275 |
(a)Use a calculator with mean and standard deviation keys to find the sample mean yearxand sample standard deviations. (Round your answers to four decimal places.)
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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