Tree-ring dating from archaeological excavation sites is used in conjunction with other chronologic evidence to estimate occupation dates of prehistoric Indian ruins in the southwestern United States. Suppose it is thought that a certain pueblo was occupied around 1302 A.D. (based on evidence from potsherds and stone tools). The following data give tree-ring dates (A.D.) from adjacent archaeological sites: 1202 1280 1281 1288 1288 1284 1285 1329 1330 1243 USE SALT (a) Use a calculator with sample mean and standard deviation keys to find x and s. (Write your standard deviation in years and round it to four decimal place.) x = 1280.22 A.D. S = 39.4645 x yr (b) Assuming the tree-ring dates in this excavation area follow a distribution that is approximately normal, does this information indicate that the population mean of tree-ring dates in the area is different from (either higher or lower than) 1302 A.D.? Use a 1% level of significance. (i) What is the level of significance? -1.6555 State the null and alternate hypotheses. (Enter != for # as needed.) Ho H