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Ch 8 Homework F10

# Ch 8 Homework F10 - Chapter Eight Homework Assignment Due...

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Chapter Eight Homework Assignment Due October 21, 2010 There are two parts: problems assigned from your text and example examination problems. You are responsible for both parts. Of course, you are encouraged to use a statistical computing package to perform the calculations. 8.4. In example 8.2, suppose the psychologist wanted to compare method 1 to method 2. What is the advantage of using a t test having 2 W s in the denominator as opposed to using the conventional pooled t test of Chapter 5, with 2 p s , the average of the sample variances from method 1 and method 2 data? 8.5. For an experiment comparing t treatments with samples sizes t n n n , , , 2 1 and sample variances 2 2 2 2 1 , , , t s s s , consider the following questions. a. If the sample sizes satisfy t n n n = = = 2 1 , show the 2 W s is the average of the t sample variances 2 2 2 2 1 , , , t s s s . b. Does this hold if the sample sizes are not equal? If not, why not just use the average?

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Ch 8 Homework F10 - Chapter Eight Homework Assignment Due...

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