Question

please show steps to calculate
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 1278 1320 1201 1268 1316 1275 1317 1275

(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.

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