1. Copyright © 2013 Pearson Education, Inc. All rights reserved Chapter 9 Inferences Based on Two Samples Confidence Intervals and Tests of Hypotheses

2. Copyright © 2013 Pearson Education, Inc. All rights reserved 9.1 Identifying the Target Parameter

3. 9 - 3 Copyright © 2013 Pearson Education, Inc.. All rights reserved. Procedure

4. Copyright © 2013 Pearson Education, Inc. All rights reserved 9.2 Comparing Two Population Means: Independent Sampling

5. 9 - 5 Copyright © 2013 Pearson Education, Inc.. All rights reserved. Table 9.1

6. 9 - 6 Copyright © 2013 Pearson Education, Inc.. All rights reserved. Figure 9.1 SPSS analysis of diet study data

7. 9 - 7 Copyright © 2013 Pearson Education, Inc.. All rights reserved. Figure 9.2 Sampling distribution of

8. 9 - 8 Copyright © 2013 Pearson Education, Inc.. All rights reserved. Definition

9. 9 - 9 Copyright © 2013 Pearson Education, Inc.. All rights reserved. Procedure

10. 9 - 10 Copyright © 2013 Pearson Education, Inc.. All rights reserved. Procedure

11. 9 - 11 Copyright © 2013 Pearson Education, Inc.. All rights reserved. Definition

12. 9 - 12 Copyright © 2013 Pearson Education, Inc.. All rights reserved. Figure 9.3 Rejection region for Example 9.2

13. 9 - 13 Copyright © 2013 Pearson Education, Inc.. All rights reserved. Figure 9.4 The observed significance level for Example 9.2

14. 9 - 14 Copyright © 2013 Pearson Education, Inc.. All rights reserved. Figure 9.5 Assumptions for the two-sample t; (1) normal populations; (2) equal variances

15. 9 - 15 Copyright © 2013 Pearson Education, Inc.. All rights reserved. Procedure

16. 9 - 16 Copyright © 2013 Pearson Education, Inc.. All rights reserved. Procedure

17. 9 - 17 Copyright © 2013 Pearson Education, Inc.. All rights reserved. Definition

18. 9 - 18 Copyright © 2013 Pearson Education, Inc.. All rights reserved. Table 9.2

19. 9 - 19 Copyright © 2013 Pearson Education, Inc.. All rights reserved. Figure 9.6 SAS printout for Example 9.4

20. 9 - 20 Copyright © 2013 Pearson Education, Inc.. All rights reserved. Figure 9.7 Normal probability plots for Example 9.4

21. 9 - 21 Copyright © 2013 Pearson Education, Inc.. All rights reserved. Figure 9.8 MINITAB box plots for Example 9.4

22. 9 - 22 Copyright © 2013 Pearson Education, Inc.. All rights reserved. Procedure

23. 9 - 23 Copyright © 2013 Pearson Education, Inc.. All rights reserved. Procedure

24. 9 - 24 Copyright © 2013 Pearson Education, Inc.. All rights reserved. Figure SIA9.1 MINITAB comparison of two price change means

25. 9 - 25 Copyright © 2013 Pearson Education, Inc.. All rights reserved. Figure SIA9.2 MINITAB comparison of two Trading volume means

26. Copyright © 2013 Pearson Education, Inc. All rights reserved 9.3 Comparing Two Population Means: Paired Difference Experiments

27. 9 - 27 Copyright © 2013 Pearson Education, Inc.. All rights reserved. Table 9.3

28. 9 - 28 Copyright © 2013 Pearson Education, Inc.. All rights reserved. Figure 9.9 MINITAB printout of an invalid analysis of reading test scores in 9.3

29. 9 - 29 Copyright © 2013 Pearson Education, Inc.. All rights reserved. Table 9.4

30. 9 - 30 Copyright © 2013 Pearson Education, Inc.. All rights reserved. Figure 9.10 Rejection region for Example 9.4

31. 9 - 31 Copyright © 2013 Pearson Education, Inc.. All rights reserved. Figure 9.11 MINITAB paired difference analysis of reading test scores

32. 9 - 32 Copyright © 2013 Pearson Education, Inc.. All rights reserved. Procedure

33. 9 - 33 Copyright © 2013 Pearson Education, Inc.. All rights reserved. Procedure

34. 9 - 34 Copyright © 2013 Pearson Education, Inc.. All rights reserved. Definition

35. 9 - 35 Copyright © 2013 Pearson Education, Inc.. All rights reserved. Definition

36. 9 - 36 Copyright © 2013 Pearson Education, Inc.. All rights reserved. Table 9.5

37. 9 - 37 Copyright © 2013 Pearson Education, Inc.. All rights reserved. Figure 9.12 SAS analysis of salary differences

38. 9 - 38 Copyright © 2013 Pearson Education, Inc.. All rights reserved. Figure 9.13 SPSS analysis of salaries, assuming independent samples

39. 9 - 39 Copyright © 2013 Pearson Education, Inc.. All rights reserved. Procedure

40. Copyright © 2013 Pearson Education, Inc. All rights reserved 9.4 Comparing Two Population Proportions: Independent Sampling

41. 9 - 41 Copyright © 2013 Pearson Education, Inc.. All rights reserved. Table 9.6

42. 9 - 42 Copyright © 2013 Pearson Education, Inc.. All rights reserved. Definition

43. 9 - 43 Copyright © 2013 Pearson Education, Inc.. All rights reserved. Procedure

44. 9 - 44 Copyright © 2013 Pearson Education, Inc.. All rights reserved. Procedure

45. 9 - 45 Copyright © 2013 Pearson Education, Inc.. All rights reserved. Definition

46. 9 - 46 Copyright © 2013 Pearson Education, Inc.. All rights reserved. Table 9.7

47. 9 - 47 Copyright © 2013 Pearson Education, Inc.. All rights reserved. Figure 9.14 Rejection region for Example 9.6

48. 9 - 48 Copyright © 2013 Pearson Education, Inc.. All rights reserved. Figure 9.15 MINITAB output for test of two proportions

49. 9 - 49 Copyright © 2013 Pearson Education, Inc.. All rights reserved. Figure SIA9.3 MINITAB comparison of two proportions analysis

50. Copyright © 2013 Pearson Education, Inc. All rights reserved 9.5 Determining the Sample Size

51. 9 - 51 Copyright © 2013 Pearson Education, Inc.. All rights reserved. Procedure

52. 9 - 52 Copyright © 2013 Pearson Education, Inc.. All rights reserved. Procedure

53. Copyright © 2013 Pearson Education, Inc. All rights reserved Comparing Two Population Variances: Independent Sampling (Optional) 9.6

54. 9 - 54 Copyright © 2013 Pearson Education, Inc.. All rights reserved. Figure 9.16 An F-distribution with 7 numerator and 9 denominator degrees of freedom

55. 9 - 55 Copyright © 2013 Pearson Education, Inc.. All rights reserved. Table 9.8

56. 9 - 56 Copyright © 2013 Pearson Education, Inc.. All rights reserved. Figure 9.17 An F-distribution for  1 = 7 and  2 = 9 df;  =.05

57. 9 - 57 Copyright © 2013 Pearson Education, Inc.. All rights reserved. Table 9.9

58. 9 - 58 Copyright © 2013 Pearson Education, Inc.. All rights reserved. Figure 9.18 MINITAB summary statistics and F-test for mice weights

59. 9 - 59 Copyright © 2013 Pearson Education, Inc.. All rights reserved. Figure 9.19 Rejection region for Example 9.10

60. 9 - 60 Copyright © 2013 Pearson Education, Inc.. All rights reserved. Procedure

61. 9 - 61 Copyright © 2013 Pearson Education, Inc.. All rights reserved. Procedure

62. 9 - 62 Copyright © 2013 Pearson Education, Inc.. All rights reserved. Definition

63. 9 - 63 Copyright © 2013 Pearson Education, Inc.. All rights reserved. Table 9.10

64. 9 - 64 Copyright © 2013 Pearson Education, Inc.. All rights reserved. Figure 9.20 SAS F-test for testing assumption of equal variances

65. 9 - 65 Copyright © 2013 Pearson Education, Inc.. All rights reserved. Procedure