University of the People MATH 1281Graded Quiz Unit 6

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In Figure 2 you may Ònd a scatter plot with 10 points and 3 lines. Three of the points are marked by the letters a, b, and c. The lines are marked by the numbers 1, 2, and 3. The following 2 questi... ons refer to this scatter plot. Fit a regression model to the relation between "curb.weight" as a response and "engine.size" as an explanatory variable. Both variables belong to the data set "cars.csv". The following 3 refer to the Òtted model. MATH 1281 Statistical Inference - Term 1, 2018-201910/18/2018 Graded Quiz Unit 6 https://my.uopeople.edu/mod/quiz/review.php?attempt=1453891 2/11 Question 1 Correct Mark 1.00 out of 1.00 Question 2 Correct Mark 1.00 out of 1.00 Question 3 Correct Mark 1.00 out of 1.00 The estimated value of the slope is equal to: (Give an answer of the form x.xxx with 3 signiÒcance digits) Answer: 10.635 The correct answer is: 10.6354 Test the null hypothesis the intercept is equal to 0. This null hypothesis is: Select one: a. Not rejected with a signiÒcance level of 5%. b. Rejected with a signiÒcance level of 5%, but not with a signiÒcance level of 1%. c. Rejected with a signiÒcance level of 1%, but not with a signiÒcance level of 0.1%. d. Rejected with a signiÒcance level of 0.1% The correct answer is: Rejected with a signiÒcance level of 0.1% Use the function "conÒnt" in order to construct a conÒdence interval to the slope of the regression line. The value 0: Select one: a. Belongs to the 95% conÒdence interval. b. Does not belongs to the 95% conÒdence interval. The correct answer is: Does not belongs to the 95% conÒdence inter [Show More]

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