week 2 assignment e text - Week 2 Chapter 9 E-Text...

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Week 2 Chapter 9 E-Text Assignment Name: 1. (Chapter 9 Review question #5, page 387) (a) Explain the difference between a left-sided test, two-sided test, and right-sided test.   In a two tailed test,  we reject the null hypothesis if the actual value is too high or too low. In a left tail test, we reject it if the actual value is less than what  we expect. In the right tail test, we reject it if the actual value is too high. (b) When would we choose a two-sided test? If the null hypothesis is rejected (c) How can we tell the direction of the test by looking at a pair of hypotheses ? The way to tell  which type of tail(s) to use is to look for words such as "equal to" (two tail), "less than" or "greater than".  2. (Section exercise 9.2, page 356) In 1,000 samples, assuming that H 0 is true, how many times would you expect to commit Type I error if (a) α = .05, 1000 x 0.05 = 50 (b) α = .01, 1000 x 0.10 = 100 (c) α = .001 1000 x 0.001 = 1 3. (Section exercise 9.5, page 356) A firm decides to test its employees for illegal drugs.
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