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Confidence interval for the mean of all tree-ring dates

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Reference no: EM132399933

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 1,194 1,250 1,250 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.

Reference no: EM132399933

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