An old saying in golf is “You drive for show and you putt for dough.” 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 69of the nearly 1000players on the PGA Tour’s world money list are examined. The average number of putts per hole and the player’s total winnings for the previous season is recorded. A least-squares regression line was fitted to the data. The following results were obtained from statistical software.

Suppose that the researchers test the hypotheses H0:β=0: Ha:β<0. The value of the t statistic for this test is

(a)2.61

(b)2.44

(c)0.081

(d)-2.44

(e) -20.24

Short Answer

Expert verified

The value of thet statistic for this test is option (d) -2.44

Step by step solution

01

Given information

Given in the question that, the data from a random sample of 69of the nearly1000 players on the PGA Tour’s world money list are examined. The average number of putts per hole and the player’s total winnings for the previous season is recorded.

02

Explanation

The given values are

b=-4139198

SEb=1698371

H0:β=0

Ha:β<0

Find the value of test statistic

localid="1650644518754" t=b-β0SEb=-4139198-01698371-2.437-2.44.

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Most popular questions from this chapter

Is wine good for your heart? A researcher from the University of California, San Diego, collected data on average per capita wine consumption and heart disease death rate in a random sample of 19 countries for which data were available. The following table displays the data.

(a) Is there statistically significant evidence of a negative linear relationship between wine consumption and heart disease deaths in the population of countries? Carry out an appropriate significance test at the α=0.05level.

(b) Calculate and interpret a 95% confidence interval for the slope β of the population regression line.

Some high school physics students dropped a ball and measured the distance fallen (in centimeters) at various times (in seconds) after its release. If you have studied physics, then you probably know that the theoretical relationship between the variables is distance =490(time)2. A scatterplot of the students’ data showed a clear curved pattern. At 0.68seconds after release, the ball had fallen 220.4centimeters. How much more or less did the ball fall than the theoretical model predicts?

(a) More by 226.576centimeters

(b) More by 6.176centimeters

(c) No more and no less

(d) Less by 226.576centimeters

(e) Less by centimeters

Stats teachers' cars A random sample of AP Statistics teachers were asked to report the age (in years) and mileage of their primary vehicles. A scatterplot of the data is shown below.

Computer output from a least-squares regression analysis of these data is shown below. Assume that the conditions for regression inference are met.

(a) Verify that the 95% confidence interval for the slope of the population regression line is (9016.4, 14,244.8 ).

(b) A national automotive group claims that the typical driver puts 15,000 miles per year on his or her main vehicle. We want to test whether AP Statistics teachers are typical drivers. Explain why an appropriate pair of hypotheses for this test is H0:β=15,000versus Ha:β15,000.

(c) What conclusion would you draw for this significance test based on your interval in part (a)? Justify your answer.

In the casting of metal parts, molten metal flows through a “gate” into a die that shapes the part. The gate velocity (the speed at which metal is forced through the gate) plays a critical role in die casting. A firm that casts cylindrical aluminum pistons examined a random sample of 12 pistons formed from the same alloy of metal. What is the relationship between the cylinder wall thickness (inches) and the gate velocity (feet per second) chosen by the skilled workers who do the casting? If there is a clear pattern, it can be used to direct new workers or to automate the process.

Construct and interpret a 95%confidence interval for the slope of the population regression line. Explain how this interval is consistent with the results of Exercise R12.2.

Snowmobiles

(a) If we choose a survey respondent at random, what’s the probability that this individual (i) is a snowmobile owner? (ii) belongs to an environmental organization or owns a snowmobile? (iii) has never used a snowmobile given that the person belongs to an environmental organization?

(b) Are the events “is a snowmobile owner” and “belongs to an environmental organization” independent for the members of the sample? Justify your answer.

(c) If we choose two survey respondents at random, what’s the probability that (i) both are snowmobile owners? (ii) at least one of the two belongs to an environmental organization?

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