7.3.2

(Sampling exercise) Simulate choosing random samples from two different populations, as follows. First, proceed as in Exercise 7.3.1 to choose two random sam ples of five ellipses each and measure their lengths. Then add 6 mm to each measurement in one of the samples.

(a) Compare the means of your two samples, using ar test ata0.05. to each measurement in one of the samples. If the coin falls tails, do not modify either sample.

(a) Prepare two copies of the simulated data. On the Student Copy, show the data only; on the Instructor Copy, indicate also which sample (if any) was modified.

(b) Give your Instructor Copy to the instructor and trade your Student Copy with another student when you are told to do so

(c) After you have received another student's paper, compare the means of his or her two samples using a two-tailed t test at a = 0.05. If you reject Ho, decide which sample was modified.