Question

The method of tree ring dating gave the follwing years A.D. for an archaeological excavation site. Assume that the population of x values has an approximately normal distribution.

1250 1194 1278 1278 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.

x=

s=

(b) Find a 90% confidence interval for the mean of all tree ring dates from this archaeological site

lower limit-

upper limit-

Answer 1

TOPIC:Confidence interval for the population mean.

(Define,

t_/2;n-1 = upper /2-th percentile of t_n-1-distribution,obtained from t-critical value table.)