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Chapter 12: Q. AP4.40 (page 834)
AP4.40 The table provides data on the political affiliation and opinion about the death penalty of 850 randomly selected voters from a congressional district.
a.
b.
c.
d.
e.
The correct answer is option (b) .
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Multiple Choice Select the best answer for Exercises 23-28. Exercises 23-28 refer to the following setting. To see if students with longer feet tend to be taller, a random sample of students was selected from a large high school. For each student, foot length and height were recorded. We checked that the conditions for inference about the slope of the population regression line are met. Here is a portion of the computer output from a least-squares regression analysis using these data:
Which of the following is the equation of the least-squares regression line for predicting height from foot length?
a. (foot length) (foot length)
b. (foot length) (foot length)
c. (foot length) (foot length)
d. (foot length)(foot length)
e. (foot length)(foot length)
A Harris poll found that of American adults don鈥檛 think that human beings developed from earlier species. The poll鈥檚 margin of error for confidence was . This means that
a. there is a chance the interval () contains the true per cent of American adults who do not think that human beings developed from earlier species.
b. the poll used a method that provides an estimate within 3% of the truth about the population in of samples.
c. if Harris conducts another poll using the same method, the results of the second poll will lie between and
d. there is a 3% chance that the interval is incorrect.
e. the poll used a method that would result in an interval that contains in of all possible samples of the same size from this population.
The professor swims Here are data on the time (in minutes) Professor Moore takes to swim yards and his pulse rate (beats per minute) after swimming on a random sample of days:
Is there convincing evidence of a negative linear relationship between Professor Moore鈥檚 swim time and his pulse rate in the population of days on which he swimsyards?
Less mess? Kerry and Danielle wanted to investigate if tapping on a can of soda would reduce the amount of soda expelled after the can has been shaken. For their experiment, they vigorously shook cans of soda and randomly assigned each can to be tapped for seconds, seconds, seconds, or seconds. After opening the cans and waiting for the fizzing to stop, they measured the amount expelled (in milliliters) by subtracting the amount remaining from the original amount in the can. Here are their data:
Here is some computer output from a least-squares regression analysis of these data. Construct and interpret a confidence interval for the slope of the true regression line.
Exercises T12.4鈥揟12.8 refer to the following setting. An old saying in golf is 鈥淵ou drive for show and you putt for dough.鈥� The point is that good putting is more important than long driving for shooting low scores and hence winning money. To see if this is the case, data from a random sample of 69 of the nearly 1000 players on the PGA Tour鈥檚 world money list are examined. The average number of putts per hole (fewer is better) and the player鈥檚 total winnings for the previous season are recorded and a least-squares regression line was fitted to the data. Assume the conditions for inference about the slope are met. Here is computer output from the regression analysis:
T12.7 Which of the following is the 95% confidence interval for the slope 尾1 of the population regression line?
a.
b. )
c.
d.
e.
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