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.

1229

1194

1229

1201

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. (Round your answers to the nearest whole number.)

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 normal distribution.

1,250

1,278

1,299

1,180

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 the nearest whole number.)

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 =

upper limit =

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.

1,180

1,236

1,306

1,194

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 the nearest whole number.)

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.

Answer 1

(1) from calculat ογ: heg Ca) bo . con fidence interved 1s 12.5 6 i ± 1.8585 %/G. 1256 t 28S123 ne-gay-confdenceintervalist 1223-43ナ1284.5123 12214, 1033123) looe limit 128A upper limi+ 1285. ta) The 90 confidence interval is 1273 ± 1,8535 x 47 12+3 t63 anfidence interval istn 4643-ngg upper limit123g Ad

(3) na 9 X 163 A D 85953 1263 t 31.G ( The 40 con fidence interval is123 1:39 1294.61) touo er bound 123kAD und 129s AD