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Chapter 12: Q.7 (page 797)
A 95% confidence interval for the slope B of the population regression line is
A 95% confidence interval for the slope B of the population regression line is41391983396742" width="9" height="19" role="math">
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The P-value for the test in Question 5 is . A correct interpretation of this result is that
(a) the probability that there is no linear relationship between an average number of putts per hole and total winnings for these players is .
(b) the probability that there is no linear relationship between the average number of putts per hole and total winnings for all players on the PGA Tour’s world money list is .
(c) if there is no linear relationship between an average number of putts per hole and total winnings for the players in the sample, the probability of getting a random sample of players yields a least-squares regression line with a slope of or less is .
(d) if there is no linear relationship between an average number of putts per hole and total winnings for the players on the PGA Tour’s world money list, the probability of getting a random sample of 69 players yields a least-squares regression line with a slope of or less is .
(e) the probability of making a Type II error is.
An experimenter wishes to test whether or not two types of fish food (a standard fish food and a new product) work equally well at producing fish of equal weight after a two-month feeding program. The experimenter has two identical fish tanks (1 and 2) to put fish in and is considering how to assign , each of which has a numbered tag, to the tanks. The best way to do this would be to
(a) put all the odd-numbered fish in one tank, the even in the other, and give the standard food type to the odd-numbered ones.
(b) obtain pairs of fish whose weights are virtually equal at the start of the experiment and randomly assign one to Tank 1 and the other to , with the feed assigned at random to the tanks.
(c) proceed as in part (b), but put the heavier of the pair into .
(d) assign the fish at random to the two tanks and give the standard feed to .
(e) not proceed as in part (b) because using the initial weight in part (b) is a nonrandom process. Use the initial length of the fish instead.
A study of road rage asked random samples of men and women about their behavior while driving. Based on their answers, each respondent was assigned a road rage score on a scale of to . The respondents were chosen by random digit dialing of telephone numbers. Are the conditions for two-sample t inference satisfied?
(a) Maybe. The data came from independent random samples, but we need to examine the data to check for Normality.
(b) No. Road rage scores in a range between and can’t be Normal.
(c) No. A paired t test should be used in this case.
(d) Yes. The large sample sizes guarantee that the corresponding population distributions will be Normal.
(e) Yes. We have two independent random samples and large sample sizes, and the condition is met.
What is the correlation between the selling price and appraised value?
(a) 0.1126
(c) -0.861
(e) -0.928
(b) 0.861
(d) 0.928
Snowmobiles (11.2) Do these data provide convincing evidence of an association between environmental club membership and snowmobile use for the population of visitors to Yellowstone National Park? Carry out an appropriate test at the significance level
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