*5. The following results are for two samples, one from Population 1 and the other from Population 2:

from Population 1 : 3; 5; 7; 5 from Population 2 : 8; 9; 6; 5; 12

(a) Compute SS1 and SS2.

(b) Using the results from Problem 5a, compute the pooled variance estimate.

(c) Using the result from Problem 5b, obtain sX1X2

.

(d) Test H0: m1  m2 ¼ 0 against H1: m1  m2 < 0 (a ¼ :05).

(e) Draw final conclusions.

interval estimation of m1  m2 sample size and statistical significance effect size explained variance randomization experimental control statistical inferences vs.

nonstatistical generalizations Exercises 297