The method of tree ring dating gave the following years A.D. for an archaeologic

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. 1215 1306 1257 1278 1268 1316 1275 1317 1275 (a) Use a calculator with mean and standard deviation keys to find the sample mean year x^bar and sample standard deviation s. (Round your answers to the nearest whole number.) x^bar = _________ 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.

Explanation / Answer

a) sample Mean = Sum of all observations/9 = 1279

Standard devation = 32

b) For 90% Interval

margin of error = (T.INV(0.95,8)*32)/Sqrt(10) = 19.93447

90% Interval

(1279-19.93447, 1279+19.93447)

(1259, 1298)

Lower Limit : 1259

Upper Limit: 1298

Related Questions

Navigate

• Browse (All)
• Browse T
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.