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Chapter 11: Q. 39 (page 755)
How to quit smoking Refer to Exercise . Which treatment seems to be most effective? Least effective? Justify your choices.
The most effective treatment is a patch plus drug and the least effective is a Nicotine patch.
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For these data, with a P-value of approximately . Assuming that the researchers used a significance level of , which of the following is true?
a. A Type I error is possible.
b. A Type II error is possible.
c. Both a Type I and a Type II error are possible.
d. There is no chance of making a Type I or Type II error because the P-value is approximately .
e. There is no chance of making a Type I or Type II error because the calculations are correct.
Where do you live? Conduct a follow-up analysis for the test in Exercise 49.
Fruit flies Biologists wish to mate pairs of fruit flies having genetic makeup RrCc, indicating that each has one dominant gene (R) and one recessive gene (r) for eye color, along with one dominant (C) and one recessive (c) gene for wing type. Each offspring will receive one gene for each of the two traits from each parent, so the biologists predict that the following phenotypes should occur in a ratio of
Assume that the conditions for inference are met. Carry out a test at the significance level of the proposed genetic model.
Sorry, no chi-square How do U.S. residents who travel overseas for leisure differ from
those who travel for business? The following is the breakdown by occupation.
| Occupation | Leisure travelers (%) | Business travelers (%) |
| Professional/technical | ||
| Manager/executive | ||
| Retired | ||
| Student | ||
| Other | ||
| Total |
Explain why we can鈥檛 use a chi-square test to learn whether these two distributions differ
significantly.
Sorry, no chi-square We would prefer to learn from teachers who know their subject. Perhaps even preschool children are affected by how knowledgeable they think teachers are. Assign three- and four-year-olds at random to be taught the name of a new toy by either an adult who claims to know about the toy or an adult who claims not to know about it. Then ask the children to pick out a picture of the new toy from a set of pictures of other toys and say its name. The response variable is the count of right answers in four tries. Here are the data:
The researchers report that children who were taught by the teacher claiming to be knowledgeable did significantly better (), Explain why this result isn't valid.
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