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. 1,271 1,215 1,278 1,313 1,278 1,180 1,320 1,243 (a) Find the sample mean year x and sample standard deviation s. (Round your answers to four decimal places.) A.D. yr x = LAUSE SALT S= (b) When finding an 90% confidence interval, what is the critical value for confidence level? (Give your answer to three decimal places.). to = What is the maximal margin of error when finding a 90% confidence interval for the mean of all tree-ring dates from this archaeological site? (Round your answer to the nearest whole number.) E= 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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