Question

The method of tree-ring dating gave the following years a.d. for an archaeological excavation site. Assume taht the population of x values has as approximately normal distribution

1,208 1,264 1,267 1,180 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 deviation s. Round your answers to the nearest whole number

x= a.d.

s= yr

(b) when finding a 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 arcaeological site. (Round your answers to the nearest whole number)

lower limit a.d.

upper limit a.d.

Answer 1