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. 1,201 1,285 1,194 1,257 1,268 1,316 1,275 1,317 1,275
A button hyperlink to the SALT program that reads: Use SALT.
(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 four decimal places.)
x
=
1265.3333

Correct: Your answer is correct.
A. D.
s =
43.4655

Correct: Your answer is correct.
yr
(b)
When finding an 90% confidence interval, what is the critical value for confidence level? (Give your answer to three decimal places.)
tc =
1156.7121

Incorrect: Your answer is incorrect.
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
2867.92

Incorrect: Your answer is incorrect.
A. D.