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1. Verify that the 0.95 confidence interval for the difference between the means, based on the data in given Table and Student's T, is (2.2, 20.5). What are the practical exercises with this confidence interval.
2. Student's T rejects the hypothesis of equal means based on the data in given Table. Interpret what this means.
Table : Weight gain (in Grams) of Rats in Ozone Experiment
Control:
41.0
38.4
24.4
25.9
21.9
18.3
13.1
27.3
28.5
-16.9
Ozone:
10.1
6.1
20.4
7.3
14.3
15.5
-9.9
6.8
28.2
17.9
26.0
17.4
21.8
15.4
27.4
19.2
22.4
17.7
29.4
-9.0
-12.9
14.0
6.6
12.1
15.7
39.9
-15.9
54.6
-14.7
21.4
26.6
22.7
44.1
What are the limitations of this analysis? Can you think of some hidden variables that could affect what you are seeing in the data?
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A private consultant was asked to evaluate a job-retraining program. As part of the evaluation, she determined the income of 112 individuals before and after retraining. She found a T value of 4077. Complete the analysis and draw a conclusion.
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explain why the standard error of the mean decreases with increasing sample size. provide a mathematical explanation in
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