Question

the method of tree ring dating gave the following years ad for an archaeological excavation site assume that the population of x-values has an approximately normal distribution 1292, 1229, 1264, 1299, 1268, 1316, 1275, 1317, 1275, hey use a calculator with mean and standard deviation keys to find the sample mean year bar X and Sample standard deviation s round your answers to the nearest whole number do you find a 90% confidence interval for the mean of altering dates from this archaeological site round your answer to the nearest whole number

Answer 1

We can use the TI-84 calculator .

First enter all given data point in L1 column

Press STAT key ---> 1:Edit

Now press STAT key ---> Scroll to CALC ---> Select 1-Var Stat and hit enter

For List : L1 ( Press 2ND key and 1 )

Then directly scroll to calculate and hit enter.

Sample mean = 1282

Sample standard deviation s = 28

To find 95% confidence interval :

Press STAT key ---> Scroll to TESTS ---> Scroll to T interval and hit enter

Select Data and hit enter

For list : L1 ( Press 2ND key and 1 )

For C- level = 0.9

Scroll to calculate and hit enter

90% confidence interval for the mean of altering dates from this archaeological site is ( 1264, 1299 )