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a.) The method of tree ring dating gave the following years A.D. for an archaeological excavation...

a.) 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.

1229 1236 1271 1229 1268 1316 1275 1317 1275

mean = 1268

standard deviation = 33
(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;

Math   Statistics-And-Probability   
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