Sample Examination One - La Jolla High School

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Sample Exarnination One Section X Use thefollowing information.for question 5 and 6 Those that study child development found a linear regression model for infants that uses age in months to predict height. A sample of l2 babies was randomly selected and the information shoivn below was senerated. S = 0 . 2560 R_Sq = 68 .98 R_Sq (adj ) = 69.5% Variable N Meari l"leor an TrMean StDev SE Mean Ase L2 23 .50 23.50 23.50 3 .61 1.04 Heisht L2 79.850 79.800 79 .860 2.302 0.565 5. The approximate slope of the least squares line is (A) 0.44 (B) 0.s3 (c) 1.08 (D) 1.30 (E) The slope cannot be determined from the given information 6. About what percent of the observed variation in the height can be explained by leastsquares regression of height on age? (A) 26% (B) 2e% (c) 6e% (D) 83% (E) es% tJnauthorized copying or reusing any part of this page is Answer nAnswer
Section I Sample Examination One 7. In a statistics course, a linear regression equation was computed to predict the final exam score based on the score on the first test of the term. The equation was: y = 25 + 0.7 x where y is the final exam score and x is the score on the first test. George scored 80 on the first test. On the final exam Georse scored 85. What is the value of his residual? (A) (B) (c) (D) (E) I -T ,+ -.J 8l 8. Suppose the regression line for a set of data, If x and y are the sample means of the x and y (A) t (B) 7-2 (c) r+5 (D) 3x (E) 3r- I IAnswer ] = 3x + b, passes through point (2, 5)" values respectively, then y = Ansrver 9. You have sampled 25 students to find the mean SAT scores at Morris Knolls High School. A95% confidence interval forthe mean SAT score is 900 to 1100. Which of the following statement gives a valid interpretation of this interval? (A) 95% of the 25 students have a mean score between 900 and I 100. (B) 95% of the population of all students at Morris Knolls have a score between 900 and 1,100. (C) If this procedure were repeated many times, 95Y, of the resulting confidence intervals would contain the true mean SAT score at Morris Knolls. (D) If this procedure were repeated many times, 95%o of the sample means would be between 900 and 1100. (E) If 100 samples were taken and a95%o confidence interval was computed,5 of them would be in the interval from 900 to 1100. Answer Unauthorized copying or reusing any part of this page is illegal.
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Sample Examination One - La Jolla High School

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