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Interval Estimate of μ1 - μ2 : Small Sample
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 taken from the company's records provided the following exam scores for 10 workers who did not receive in-house training and 8 workers who did receive training.
No Training
Training
76
80
66
60
71
91
79
73
94
77
74
82
83
68
78
75
86
Develop a 95% confidence interval estimate for the difference between the average test scores for the populations of employees.
Hypothesis Test about μ1 - μ2 : Small Sample
Refer to the certification exam score data in Exercise 2. Using α = 0.05, test for any difference between the average test scores for the two populations of employees.
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how many individuals will I need to sample if I want a 95% margin of error to be no more than 3%, I want to know if the results are significant at = 10%. With the information given.
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