A manager is thinking of providing, on a regular basis, in-house training for employees preparing for an inventory management certification exam. In the past, some employees received the in- house training before taking the exam, while others did not. Independent random samples selected from the company's records provided the following exam scores for 10 workers who did not receive in-house training and eight workers who did receive training.

No Training Training

76 80

80 66

60 71

91 79

73 94

77 74

82 83

68 78

75 86

1.Develop a 95% confidence interval estimate for the difference between the average test scores for the two populations of employees.

2.Using = .05, test for any difference between the average test scores for the two populations of employees.