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. 1,264 1,243 1,180 1,257 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 four decimal places.) x = _____ A.D. s = _____ yr (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.
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
1,264 1,243 1,180 1,257 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 four decimal places.)
x = _____ A.D.
s = _____ yr
(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.
According to the provided information,
the sample value are: 1264, 1243, 1180, 1257, 1268, 1316, 1275, 1317, 1275
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