47)Consider the following partially completed computer printout for a regression analysis where the dependentvariable is the price of a personal computer and the independent variable is the size of the hard drive.Based on the information provided, what percentage of the variation in the price of the personal computers isaccounted for by the regression model using hard drive capacity as the independent variable?A)About 82 percentB)217.75C)About 67 percentD)None of the above.

48)The National Football League has performed a study in which the total yards gained by teams in games wasused as an independent variable to explain the variation in total points scored by teams during games. Thepoints scored ranged from 0 to 57 and the yards gained ranged from 187 to 569. The following regression modelwas determined: y^=-12.3 +.12Given this model, which of the following statements is true?x

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49)The following regression output was generated based on a sample of utility customers. The dependent variablewas the dollar amount of the monthly bill and the independent variable was the size of the house in square feet.Based on this regression output, which of the following statements is true?

50)If the population correlation between two variables is determined to be -0.70, which of the following is knownto be true?

51)The regression equation relating attitude rating (y) and job performance rating (x) for the employees of acompany is y^=11.7 +1.02x. What is the best predicted attitude rating for a person whose job performancerating is 73?A)86.2B)12.6C)80.1D)84.9

Answer KeyTestname: 3309 - SAMPLE DEPARTMENTAL FINAL PROBLEMS1)D2)C3)B4)D5)C6)C7)D8)C9)A10)C11)D12)B13)A14)C15)B16)A17)C18)C19)B20)D21)B22)A23)D24)A25)A26)A27)A28)D29)A30)A31)D32)C33)D34)standardized test statistic ≈-2.51; critical value z0=-1.645; reject H0; There is sufficient evidence to support thetrucking firm's claim.35)A36)C37)B38)A39)C40)B41)D42)critical value t0=-2.539; standardized test statistic ≈-2.768; reject H0; There is sufficient evidence to support theMetropolitan Bus Company's claim.43)TRUE44)A45)C46)B47)C48)B

Answer KeyTestname: 3309 - SAMPLE DEPARTMENTAL FINAL PROBLEMS49)C50)C51)A