Question

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.

1,215 1,306 1,271 1,313 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 year x and sample standard deviation s. (Round your answers to the nearest whole number.)

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.

Answer 1

https://drive.google.com/open?id=1JtK-7-XuHwwX78v5tsixOgNqWtyySHXg