Answer: B 83. In the equation = + what is ? a bX, A) of the line B) intercept Y C) Predicted of given a specific value Y, X D) of when Y X=0 Answer: C 84. Assume the least squares equation is = 10 + 20X. What does the value of 10 in the equation indicate? A) intercept Y B) For each unit increased in increases by 10 Y, X C) For each unit increased in increases by 10 X, Y D) None of the above Answer: A 85. What is the variable used to predict another variable called? A) Independent variable B) Dependent variable C) Important variable D) Causal variable Answer: A 86. In regression, the difference between the confidence interval and prediction interval formulas is A) the prediction interval is the square root of the confidence interval. B) the addition of "1" to the quantity under the radical sign. C) the prediction interval uses and the confidence interval uses r. D) no difference. Answer: B 87. of the following is NOT a difference between a confidence interval and a prediction interval? A) Addition of "1" under the radical for the prediction interval. B) Confidence interval uses the standard of estimate and the prediction interval does not. C) Prediction interval refers to a specific case. D) Confidence interval is narrower than the prediction interval. Answer: B 88. When comparing the 95% confidence and prediction intervals for a given regression analysis, A) the confidence interval is wider than a prediction interval B) the confidence interval is narrower than a prediction interval C) is no difference between confidence and prediction intervals D) None of the above Answer: B
Answer: B 83. In the equation = a + bX, what is ? A) of the line B) Y intercept C) Predicted of Y, given a specific X value D) of Y when X=0 Answer: C 84. Assume the least squares equation is = 10 + 20X. What does the value of 10 in the equation indicate? A) Y intercept B) For each unit increased in Y, X increases by 10 C) For each unit increased in X, Y increases by 10 D) None of the above Answer: A 85. What is the variable used to predict another variable called? A) Independent variable B) Dependent variable C) Important variable D) Causal variable Answer: A 86. In regression, the difference between the confidence interval and prediction interval formulas is A) the prediction interval is the square root of the confidence interval. B) the addition of "1" to the quantity under the radical sign. C) the prediction interval uses and the confidence interval uses r. D) no difference. Answer: B 87. of the following is NOT a difference between a confidence interval and a prediction interval? A) Addition of "1" under the radical for the prediction interval. B) Confidence interval uses the standard of estimate and the prediction interval does not. C) Prediction interval refers to a specific case. D) Confidence interval is narrower than the prediction interval. Answer: B 88. When comparing the 95% confidence and prediction intervals for a given regression analysis, A) the confidence interval is wider than a prediction interval B) the confidence interval is narrower than a prediction interval C) is no difference between confidence and prediction intervals D) None of the above Answer: B
Ch13%20Linear%20Regression%20and%20Correlation.docx