Chapter 7.1 - 7.3 Quiz.pdf - Chapter 7.1 7.3 Quiz 9(01 PM Dashboard My courses Summer 2019 ISDS 361B-06 10247 July 8 July 14 Chapter 7.1 7.3 Quiz

Chapter 7.1 - 7.3 Quiz.pdf - Chapter 7.1 7.3 Quiz 9(01 PM...

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7/10/19, 9(01 PM Chapter 7.1 - 7.3 Quiz Page 1 of 13 Dashboard / My courses / Summer 2019 ISDS 361B-06 10247 / July 8 - July 14 / Chapter 7.1 - 7.3 Quiz Started on Wednesday, July 10, 2019, 6J55 PM State Finished Completed on Wednesday, July 10, 2019, 9J01 PM Time taken 2 hours 5 mins Points 18.00/18.00 Grade 1.29 out of 1.29 ( 100 %) Question 1 Correct 1.00 points out of 1.00 When the mean value of the response variable is independent of variation in the predictor variable, the slope of the regression line is Select one: a. zero ! b. negative c. positive d. infinite Your answer is correct. When the mean value of the response variable is independent of the variation in the predictor variable, the slope of the regression line is zero. See Section 7.1, The Simple Linear Regression Model, page 297.
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7/10/19, 9(01 PM Chapter 7.1 - 7.3 Quiz Page 2 of 13 Question 2 Correct 1.00 points out of 1.00 Question 3 Correct 1.00 points out of 1.00 The coefficient of determination Select one: a. is used to measure the slope of the estimated regression line. b. can be any positive number. c. is interpreted as the percent of the variation in the values of x that are explained by the estimated regression line. d. is defined as SSR/SST. ! Your answer is correct. The coefficient of determination is defined as SSR/SST. The coefficient of determination must be a number between 0 and 1. It is not used to measure the slope of the estimated regression line and is interpreted as the percent of the variation in the values of y that are explained by the estimated regression line. See Section 7.3, Assessing the Fit of the Simple Linear Regression Model, page 308. What would be the coefficient of determination if the total sum of squares (SST) is 30 and the sum of squares due to regression (SSR) is 27? Select one: a. 0.40 b. 0.80 c. 0.90 ! d. 0.30 Your answer is correct. The coefficient of determination = SSR/SST = 27/30 = 0.9. See Section 7.3, Assessing the Fit of the Simple Linear Regression Model, page 308
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7/10/19, 9(01 PM Chapter 7.1 - 7.3 Quiz Page 3 of 13 Question 4 Correct 1.00 points out of 1.00 Question 5 Correct 1.00 points out of 1.00 The difference between the observed value of the dependent variable and the value predicted using the estimated regression equation is known as the Select one: a. residual !
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