USE SALT 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. 1,236 1,229 1,285 1,229 1,250 1,264 1,313 1,250 (a) Find the sample mean year x and sample standard deviation s. (Round your answers to four decimal places.) X 1257 A.D. yr s 29.46 (b) When finding an 93% confidence interval, what is the critical value for confidence level? (Give your answer to three decimal places.) tc= MY NOTES ASK YOUR TE Find a 93% confidence interval for the mean of all What is the maximal margin of error when finding a 93% confidence interval for the mean of all tree-ring dates from this archaeological site? (Round your answer to the nearest whole number.) E=

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