0 |09009 9.9 Independent random samples from normal populations produced the following results: a. Calculate the pooled estimate of 0-2. b. Do the data provide sufficient evidence to indicate that \"2 > \"1 '2 Test, using a = .10. c. Find a 90% confidence interval for (\"1 #2 ). d. Which of the two inferential procedures, the test of hypothesis in part b or the confidence interval in part c, provides more information about (\"1 #2 )