Reference no: EM137677
Q. A survey of 1000 adults ages 30 to 35 is conducted. The number of years of schooling and the annual salary for each person in the survey is recorded. The correlation between years of schooling and annual salary is found to be 0.27. Suppose instead the average salary of all individuals in the survey with the same number of years of schooling was calculated and the correlation between these averages and years of schooling was computed. This correlation would most likely be
A.equal to 0.27. B.larger than 0.27. C.less than 0.27.
Q. The regression line to predict average exam grade from hours of study is y = 15 + 5.6*x. The slope of the regression line indicates
A.for any student, an extra hour of study increases the grade 5.6 points.
B.on average, an extra hour of study will increase the grade 5.6 points.
C.an extra hour of study will increase the grade 15 points.
Q. At a large department store, the amount a shopper spent and the shopper's gender (male or female) were recorded. To determine if gender is useful in explaining the amount of money a shopper spends at the store we could
A.make side-by-side boxplots of the distribution of the amount spent by males and the distribution of the amount spent by females.
B.compute the correlation between the amount spent and gender.
C.compute the least-squares regression line of amount spent on gender.
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World record time in the marathon
: The world record time (in minutes) in the marathon is plotted versus the year in which the record was set for men and women separately. The plotting symbol o is used for men and x for women. The data include only records set between 1908 and 1988.
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Data in the scatterplot
: The data in the scatterplot below are an individual's weight and the time it takes (in seconds) on a treadmill to raise his or her pulse rate to 140 beats per minute. The o's correspond to females and the +'s to males.
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Voter registration records
: A review of voter registration records in a small town yielded the following table of the number of males and females registered as Democrat, Republican, or some other affiliation.
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Effect of regular exercise on cholesterol levels
: All but one of the following statements contain a blunder. Which one does not contain a blunder
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Correlation between the amount spent and gender
: At a large department store, the amount a shopper spent and the shopper's gender (male or female) were recorded. To determine if gender is useful in explaining the amount of money a shopper spends at the store we could
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Performance in the high jump
: Below is a plot of the Olympic gold medal winning performance in the high jump (in inches) for the years 1900 to 1996.
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Consistent with the scatterplot
: Which of the following statements is consistent with the scatterplot
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Average salary
: For each of the 50 states and Washington, D.C., a number of statistics related to education are available for 1992
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Distinct curved pattern in the plot
: A researcher measures a response variable Y and explanatory variable X on each of several objects. A scatterplot of the measurements is as follows.
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