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. 1,250 1,278 1,222...


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
















1,2501,2781,2221,2921,2681,3161,2751,3171,275




(a)


Use a calculator with mean and standard deviation keys to find the sample mean year x and sample standard deviations. (Round your answers to four decimal places.)


x

= A.D.s= yr




(b)


When finding an 90% confidence interval, what is the critical value for confidence level? (Give your answer to three decimal places.)


tc =


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.




Jun 08, 2022
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