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Question 1??A study is conducted to determine if one can predict the yield of a crop based on the amount of yearly rainfall. The response variable in this study isQuestion 1 options: PRIVATE "<INPUT TYPE=\"radio\" NAME=\"tAtom346654_346755\" VALUE=\"1199380\">" MACROBUTTON HTMLDirect yield of the crop. PRIVATE "<INPUT TYPE=\"radio\" NAME=\"tAtom346654_346755\" VALUE=\"1199381\">" MACROBUTTON HTMLDirect amount of yearly rainfall. PRIVATE "<INPUT TYPE=\"radio\" NAME=\"tAtom346654_346755\" VALUE=\"1199382\">" MACROBUTTON HTMLDirect the experimenter. PRIVATE "<INPUT TYPE=\"radio\" NAME=\"tAtom346654_346755\" VALUE=\"1199383\">" MACROBUTTON HTMLDirect either bushels or inches of water.Question 2??A researcher is interested in determining if one could predict the score on a statistics exam from the amount of time spent studying for the exam. In this study, the explanatory variable isQuestion 2 options: PRIVATE "<INPUT TYPE=\"radio\" NAME=\"tAtom346656_346757\" VALUE=\"1199388\">" MACROBUTTON HTMLDirect the researcher. PRIVATE "<INPUT TYPE=\"radio\" NAME=\"tAtom346656_346757\" VALUE=\"1199389\">" MACROBUTTON HTMLDirect the amount of time spent studying for the exam. PRIVATE "<INPUT TYPE=\"radio\" NAME=\"tAtom346656_346757\" VALUE=\"1199390\">" MACROBUTTON HTMLDirect the score on the exam.Question 3??A student wonders if people of similar heights tend to date each other. She measures herself, her dormitory roommate, and the women in the adjoining rooms; then she measures the next man each woman dates. Here are the data (heights in inches):Women666466657065Men726870687469Which of the following statements is true??Question 3 options: PRIVATE "<INPUT TYPE=\"radio\" NAME=\"tAtom346657_867802\" VALUE=\"2975984\">" MACROBUTTON HTMLDirect The variables measured are all categorical. PRIVATE "<INPUT TYPE=\"radio\" NAME=\"tAtom346657_867802\" VALUE=\"2975985\">" MACROBUTTON HTMLDirect There is a strong negative association between the heights of men and women, since the women are always smaller than the men they date. PRIVATE "<INPUT TYPE=\"radio\" NAME=\"tAtom346657_867802\" VALUE=\"2975986\">" MACROBUTTON HTMLDirect There is a positive association between the heights of men and women. PRIVATE "<INPUT TYPE=\"radio\" NAME=\"tAtom346657_867802\" VALUE=\"2975987\">" MACROBUTTON HTMLDirect Any height above 70 inches must be considered an outlier.Question 4I wish to determine the correlation between the height (in inches) and weight (in pounds) of 21-year-old males. To do this I measure the height and weight of two 21-year-old men. The measured values are:?Male #1Male #2Height7075Weight160200The correlation r computed from the measurements on these males is:Question 4 options: PRIVATE "<INPUT TYPE=\"radio\" NAME=\"tAtom346658_867801\" VALUE=\"2975980\">" MACROBUTTON HTMLDirect 1.0 PRIVATE "<INPUT TYPE=\"radio\" NAME=\"tAtom346658_867801\" VALUE=\"2975981\">" MACROBUTTON HTMLDirect positive and between 0.25 and 0.75. PRIVATE "<INPUT TYPE=\"radio\" NAME=\"tAtom346658_867801\" VALUE=\"2975982\">" MACROBUTTON HTMLDirect near 0, but could be either positive or negative. PRIVATE "<INPUT TYPE=\"radio\" NAME=\"tAtom346658_867801\" VALUE=\"2975983\">" MACROBUTTON HTMLDirect exactly 0.Question 5?I wish to determine the correlation between the height (in inches) and weight (in pounds) of 21-year-old males. To do this I measure the height and weight of two 21-year-old men. The measured values are?Male #1Male #2Height7075Weight160200?Referring to the data above, the correlation r would have units in?Question 5 options: PRIVATE "<INPUT TYPE=\"radio\" NAME=\"tAtom346659_867811\" VALUE=\"2976032\">" MACROBUTTON HTMLDirect inches. PRIVATE "<INPUT TYPE=\"radio\" NAME=\"tAtom346659_867811\" VALUE=\"2976033\">" MACROBUTTON HTMLDirect pounds. PRIVATE "<INPUT TYPE=\"radio\" NAME=\"tAtom346659_867811\" VALUE=\"2976034\">" MACROBUTTON HTMLDirect inches-pounds. PRIVATE "<INPUT TYPE=\"radio\" NAME=\"tAtom346659_867811\" VALUE=\"2976035\">" MACROBUTTON HTMLDirect no units. Correlation is a unitless quantity.Question 6?The British government conducts regular surveys of household spending. The average weekly household spending on tobacco products and alcoholic beverages for each of 11 regions in Great Britain were recorded. A scatter plot of spending on tobacco versus spending on alcohol is given below. Which of the following statements holds?Question 6 options: PRIVATE "<INPUT TYPE=\"radio\" NAME=\"tAtom346660_346761\" VALUE=\"1199404\">" MACROBUTTON HTMLDirect The observation in the lower right corner of the plot is influential. PRIVATE "<INPUT TYPE=\"radio\" NAME=\"tAtom346660_346761\" VALUE=\"1199405\">" MACROBUTTON HTMLDirect There is clear evidence of negative association between spending on alcohol and tobacco. PRIVATE "<INPUT TYPE=\"radio\" NAME=\"tAtom346660_346761\" VALUE=\"1199406\">" MACROBUTTON HTMLDirect The equation of the least-squares line for this plot would be approximately y = 10 - 2x. PRIVATE "<INPUT TYPE=\"radio\" NAME=\"tAtom346660_346761\" VALUE=\"1199407\">" MACROBUTTON HTMLDirect The correlation coefficient for this data is 0.99.Question 7A researcher wishes to determine whether the rate of water flow (inliters per second) over an experimental soil bed can be used topredict the amount of soil washed away (in kilograms). Theresearcher measures the amount of soil washed away for various flowrates, and from these data calculates the least-squares regressionline to beamount of eroded soil = 0.4 + 1.3x(flow rate)The correlation between amount of eroded soil and flow rate would beQuestion 7 options: PRIVATE "<INPUT TYPE=\"radio\" NAME=\"tAtom346661_346762\" VALUE=\"1199408\">" MACROBUTTON HTMLDirect 1/1.3 PRIVATE "<INPUT TYPE=\"radio\" NAME=\"tAtom346661_346762\" VALUE=\"1199409\">" MACROBUTTON HTMLDirect 0.4 PRIVATE "<INPUT TYPE=\"radio\" NAME=\"tAtom346661_346762\" VALUE=\"1199410\">" MACROBUTTON HTMLDirect positive, but we cannot say what the exact value is. PRIVATE "<INPUT TYPE=\"radio\" NAME=\"tAtom346661_346762\" VALUE=\"1199411\">" MACROBUTTON HTMLDirect either positive or negative. It is impossible to say anything about the correlation from the information given.Question 8?A researcher wishes to study how the average weight Y (in kilograms) of children changes during the first year of life. He plots these averages versus the age X (in months) and decides to fit a least-squares regression line to the data with X as the explanatory variable and Y as the response variable. He computes the following quantities:correlation?between X and Y = 0.9;mean?of the values?of X?= 6.5;??mean?of the values?of Y?= 6.6;standard deviation?of the values?of X?= 3.6;standard deviation?of the values?of Y?= 1.2.The?slope?of the least-squares line isQuestion 8 options: PRIVATE "<INPUT TYPE=\"radio\" NAME=\"tAtom346662_1964655\" VALUE=\"6887403\">" MACROBUTTON HTMLDirect 0.30 PRIVATE "<INPUT TYPE=\"radio\" NAME=\"tAtom346662_1964655\" VALUE=\"6887404\">" MACROBUTTON HTMLDirect 0.88 PRIVATE "<INPUT TYPE=\"radio\" NAME=\"tAtom346662_1964655\" VALUE=\"6887405\">" MACROBUTTON HTMLDirect 1.01 PRIVATE "<INPUT TYPE=\"radio\" NAME=\"tAtom346662_1964655\" VALUE=\"6887406\">" MACROBUTTON HTMLDirect 3.0Question 9?A researcher wishes to determine whether the rate of water flow (inliters per second) over an experimental soil bed can be used topredict the amount of soil washed away (in kilograms). Theresearcher measures the amount of soil washed away for various flowrates, and from these data calculates the least-squares regressionline to beamount of eroded soil = 0.4 + 1.3x(flow rate)One of the flow rates used by the researcher was 0.3 liters persecond and for this flow rate the amount of eroded soil was 0.8kilograms. These values were used in the calculation of theleast-squares regression line. The residual corresponding to thesevalues isQuestion 9 options: PRIVATE "<INPUT TYPE=\"radio\" NAME=\"tAtom346663_346764\" VALUE=\"1199416\">" MACROBUTTON HTMLDirect 0.01 PRIVATE "<INPUT TYPE=\"radio\" NAME=\"tAtom346663_346764\" VALUE=\"1199417\">" MACROBUTTON HTMLDirect -0.01 PRIVATE "<INPUT TYPE=\"radio\" NAME=\"tAtom346663_346764\" VALUE=\"1199418\">" MACROBUTTON HTMLDirect 0.5 PRIVATE "<INPUT TYPE=\"radio\" NAME=\"tAtom346663_346764\" VALUE=\"1199419\">" MACROBUTTON HTMLDirect -0.5Question 10?Consider the scatter plot below. The point indicated by the plotting symbol x would beQuestion 10 options: PRIVATE "<INPUT TYPE=\"radio\" NAME=\"tAtom346655_346756\" VALUE=\"1199384\">" MACROBUTTON HTMLDirect a residual. PRIVATE "<INPUT TYPE=\"radio\" NAME=\"tAtom346655_346756\" VALUE=\"1199385\">" MACROBUTTON HTMLDirect influential. PRIVATE "<INPUT TYPE=\"radio\" NAME=\"tAtom346655_346756\" VALUE=\"1199386\">" MACROBUTTON HTMLDirect a z-score. PRIVATE "<INPUT TYPE=\"radio\" NAME=\"tAtom346655_346756\" VALUE=\"1199387\">" MACROBUTTON HTMLDirect a least-squares point.Question 11?Exercise 6-20.? Matching.Question 11 options: PRIVATE "<SELECT NAME=\"tAtom1238001_2275491_7980913\"><OPTION VALUE="" SELECTED></OPTION><OPTION VALUE="1">1</OPTION><OPTION VALUE="2">2</OPTION><OPTION VALUE="3">3</OPTION><OPTION VALUE="4">4</OPTION></SELECT>" MACROBUTTON HTMLDirect (a) PRIVATE "<SELECT NAME=\"tAtom1238001_2275491_7980916\"><OPTION VALUE="" SELECTED></OPTION><OPTION VALUE="1">1</OPTION><OPTION VALUE="2">2</OPTION><OPTION VALUE="3">3</OPTION><OPTION VALUE="4">4</OPTION></SELECT>" MACROBUTTON HTMLDirect (d) PRIVATE "<SELECT NAME=\"tAtom1238001_2275491_7980915\"><OPTION VALUE="" SELECTED></OPTION><OPTION VALUE="1">1</OPTION><OPTION VALUE="2">2</OPTION><OPTION VALUE="3">3</OPTION><OPTION VALUE="4">4</OPTION></SELECT>" MACROBUTTON HTMLDirect (c) PRIVATE "<SELECT NAME=\"tAtom1238001_2275491_7980914\"><OPTION VALUE="" SELECTED></OPTION><OPTION VALUE="1">1</OPTION><OPTION VALUE="2">2</OPTION><OPTION VALUE="3">3</OPTION><OPTION VALUE="4">4</OPTION></SELECT>" MACROBUTTON HTMLDirect (b)1.Correlation -0.977.2.Correlation -0.021.3.Correlation 0.736.4.Correlation 0.951.Question 12Exercise 6-30. Hurricane Katrina force winds extended 120 miles from its center. Katerina was a big storm, and that affects how we think about the prediction errors. Suppose we add 120 miles to each error to get an idea of how far from prediction track we might still find damaging winds. Explain what happen to the correlation between?Prediction Error?and?Year.Question 12 options: PRIVATE "<INPUT TYPE=\"radio\" NAME=\"tAtom1238002_2309804\" VALUE=\"8097932\">" MACROBUTTON HTMLDirect Correlation will be greater. PRIVATE "<INPUT TYPE=\"radio\" NAME=\"tAtom1238002_2309804\" VALUE=\"8097933\">" MACROBUTTON HTMLDirect Correlation won't change. PRIVATE "<INPUT TYPE=\"radio\" NAME=\"tAtom1238002_2309804\" VALUE=\"8097934\">" MACROBUTTON HTMLDirect Correlation will be less.Question 13?Exercise 6-42b. What is the correlation?Question 13 options: PRIVATE "<INPUT TYPE=\"radio\" NAME=\"tAtom1238003_2275493\" VALUE=\"7980924\">" MACROBUTTON HTMLDirect - 0.934 PRIVATE "<INPUT TYPE=\"radio\" NAME=\"tAtom1238003_2275493\" VALUE=\"7980925\">" MACROBUTTON HTMLDirect - 0.451 PRIVATE "<INPUT TYPE=\"radio\" NAME=\"tAtom1238003_2275493\" VALUE=\"7980926\">" MACROBUTTON HTMLDirect -.237 PRIVATE "<INPUT TYPE=\"radio\" NAME=\"tAtom1238003_2275493\" VALUE=\"7980927\">" MACROBUTTON HTMLDirect 0.125 PRIVATE "<INPUT TYPE=\"radio\" NAME=\"tAtom1238003_2275493\" VALUE=\"7980928\">" MACROBUTTON HTMLDirect 0.237 PRIVATE "<INPUT TYPE=\"radio\" NAME=\"tAtom1238003_2275493\" VALUE=\"7980929\">" MACROBUTTON HTMLDirect 0.451 PRIVATE "<INPUT TYPE=\"radio\" NAME=\"tAtom1238003_2275493\" VALUE=\"7980930\">" MACROBUTTON HTMLDirect 0.934Question 14?Exercise 6-42c. Description of the association.Question 14 options: PRIVATE "<INPUT TYPE=\"radio\" NAME=\"tAtom1238004_2275494\" VALUE=\"7980931\">" MACROBUTTON HTMLDirect Negative strong linear. PRIVATE "<INPUT TYPE=\"radio\" NAME=\"tAtom1238004_2275494\" VALUE=\"7980932\">" MACROBUTTON HTMLDirect Negative moderate not linear. PRIVATE "<INPUT TYPE=\"radio\" NAME=\"tAtom1238004_2275494\" VALUE=\"7980933\">" MACROBUTTON HTMLDirect Negative weak linear. PRIVATE "<INPUT TYPE=\"radio\" NAME=\"tAtom1238004_2275494\" VALUE=\"7980934\">" MACROBUTTON HTMLDirect Positive strong linear. PRIVATE "<INPUT TYPE=\"radio\" NAME=\"tAtom1238004_2275494\" VALUE=\"7980935\">" MACROBUTTON HTMLDirect Positive moderate linear. PRIVATE "<INPUT TYPE=\"radio\" NAME=\"tAtom1238004_2275494\" VALUE=\"7980936\">" MACROBUTTON HTMLDirect Positive weak not linear.Question 15?Exercise 7-16. Engine Size.Question 15 options: PRIVATE "<INPUT TYPE=\"radio\" NAME=\"tAtom1238181_2275495\" VALUE=\"7980937\">" MACROBUTTON HTMLDirect 17.1 mpg PRIVATE "<INPUT TYPE=\"radio\" NAME=\"tAtom1238181_2275495\" VALUE=\"7980938\">" MACROBUTTON HTMLDirect 20.78 mpg PRIVATE "<INPUT TYPE=\"radio\" NAME=\"tAtom1238181_2275495\" VALUE=\"7980939\">" MACROBUTTON HTMLDirect 27.09 mpg PRIVATE "<INPUT TYPE=\"radio\" NAME=\"tAtom1238181_2275495\" VALUE=\"7980940\">" MACROBUTTON HTMLDirect 36.12 mpgQuestion 16?Exercise 7-22. Another car.Question 16 options: PRIVATE "<INPUT TYPE=\"radio\" NAME=\"tAtom1238182_2275496\" VALUE=\"7980941\">" MACROBUTTON HTMLDirect 27.5% PRIVATE "<INPUT TYPE=\"radio\" NAME=\"tAtom1238182_2275496\" VALUE=\"7980942\">" MACROBUTTON HTMLDirect 63.8% PRIVATE "<INPUT TYPE=\"radio\" NAME=\"tAtom1238182_2275496\" VALUE=\"7980943\">" MACROBUTTON HTMLDirect 71.8% PRIVATE "<INPUT TYPE=\"radio\" NAME=\"tAtom1238182_2275496\" VALUE=\"7980944\">" MACROBUTTON HTMLDirect 84.1%Question 17?Exercise 7-68. Birthrate 2010. (Don't submit the scatterplot).b) Find the equation of the regression line.c) Check to see if the regression line isan appropriate model.d) Interpret the slope of the line. e) Estimate what the rate was in 1978.f)In 1978 the birthrate was actually 15.0? How close (compute the residual) your model come?g) Predict what the Birthrate will be in 2010.h) Predict what the Birthrate will be in 2050.? Comment on your faith in this prediction. ................
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