Question
1) Data was gathered from several homes for sale in Cincinnati, Ohio, in order to examine the relationship between the size of the house (measured
1) Data was gathered from several homes for sale in Cincinnati, Ohio, in order to examine the relationship between the size of the house (measured in square feet) and the price of the house (measured in dollars).Suppose you learn the relationship between size and price is linear, positive, and strong, withr= 0.81.You also learn that a regression equation has been constructed in order to predict house price based on house size.Based on this information, which one of the following statements is correct?
A.The units forrwould be "square feet per dollar."
B.The explanatory variable is the house price and the response variable is house size.
C.If we want to predict one variable based on the other, it doesn't matter which variable goes on they-axis when we construct a scatterplot.
D.Sinceris positive, the slope in the regression equation will also be positive.
E.Because the correlation is strong, we should conclude that house size causes a house to have a particular price.
2) Several items from the menu at Starbucks were analyzed in order to determine calorie and carbohydrate content.Is there a relationship between the number of calories in a menu item and the number of grams of carbohydrates in that menu item?When a scatterplot was constructed, the relationship was observed to be linear.The regression equation to predict carbohydrate content based on calorie content was as follows:Predicted grams of carbohydrates = 8.94 + 0.11(number of calories).Which one of the following statements is a correct interpretation of this regression equation?
A.As a number of calories goes up by 1, we predict grams of carbohydrates to increase by 8.94.
B.Because the slope is 0.11, this means the relationship between calories and carbohydrates must be weak.
C.A menu item with 0 grams of carbohydrates is predicted to have 8.94 calories.
D.11% of the variability in grams of carbohydrates can be explained by the regression equation.
E.The predicted grams of carbohydrates for a menu item with 100 calories is 19.94.
3) Consider the following five relationships.We can only use the methods discussed in Chapters 14 and 15 to describeoneof these relationships.For which one relationship would it be appropriate to construct a scatterplot, compute a value ofr, and construct a regression equation?
A.The relationship between age and opinion about COVID-19 vaccinations.
B.The relationship between hours spent sleeping and minutes spent exercising in a typical day.
C.The relationship between a person's political party affiliation and whether or not the person has a tattoo.
D.The relationship between eye color and distance lived from campus.
E.The relationship between weight and favorite ice cream flavor.
4) Can we predict or explain the gestation period (or the length of pregnancy) of a mammal based on longevity (or lifespan)?Gestation period (measured in days) and longevity (measured in years) were examined for a sample of 45 mammals, all of which had lifespans between 1 and 25 years.The correlation between gestation and longevity was found to ber= 0.59, and the regression equation to predict gestation based on longevity was as follows:Predicted gestation = 19.66 + 12.68 (longevity).Based on this information, which one of the following statements is correct?
A.The value ofrwill not change if we decide to measure longevity in months instead of years.
B.If we decide to switch which variable isxand which variable isy, the value ofrwill get bigger.
C.The percentage of variability in the gestation period thatcannotbe explained by the regression equation is approximately 35%.
D.It is appropriate to use the regression equation to predict the gestation period of any mammal with a lifespan between 1 and 100 years.
E.None of the above answer options are correct.
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