//The method of tree ring dating gave the following years A.D. for an archaeolog

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.

(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 =

s =

(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 =

upper limit =

Thanks

Explanation / Answer

Lets the data be like

1236 1285 1278 1257 1268 1316 1275 1317 1275

Data Sample Standard Deviation 25.82204054 Sample Mean 1278.555556 Sample Size 9 Confidence Level 90% Intermediate Calculations Standard Error of the Mean 8.607346847 Degrees of Freedom 8 t Value 1.8595 Interval Half Width 16.0058 Confidence Interval Interval Lower Limit 1262.55 Interval Upper Limit

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