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Find the sample mean year x and sample standard deviation

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Reference no: EM132461605

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.

1299 1243 1320 1271 1268 1316 1275 1317 1275

(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) 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.

Reference no: EM132461605

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