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10/18/2018 Graded Quiz Unit 6MATH 1281 Statistical Inference - Term 1, 2018-2019
Home ► My courses ► MATH 1281 - AY2019-T1 ► 11 October - 17 October ►
Graded Quiz Unit 6
Started on Wednesday, 17 October 2018, 6:36 PM
State Finished
Completed on Wednesday, 17 October 2018, 8:04 PM
Time taken 1 hour 27 mins
Marks 16.00/20.00
Grade 80.00 out of 100.00
Information
In Figure 2 you may nd 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 questions refer to this scatter plot.
Information
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 tted model.
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, 10/18/2018 Graded Quiz Unit 6
Question 1 The estimated value of the slope is equal to: (Give an answer of the form
Correct x.xxx with 3 signi cance digits)
Mark 1.00 out of
1.00 Answer: 10.635
The correct answer is: 10.6354
Question 2 Test the null hypothesis the intercept is equal to 0. This null hypothesis is:
Correct
Mark 1.00 out of Select one:
1.00 a. Not rejected with a signi cance level of 5%.
b. Rejected with a signi cance level of 5%, but not with a signi cance level of
1%.
c. Rejected with a signi cance level of 1%, but not with a signi cance level of
0.1%.
d. Rejected with a signi cance level of 0.1%
The correct answer is: Rejected with a signi cance level of 0.1%
Question 3 Use the function "con nt" in order to construct a con dence interval to the
Correct slope of the regression line. The value 0:
Mark 1.00 out of
1.00 Select one:
a. Belongs to the 95% con dence interval.
b. Does not belongs to the 95% con dence interval.
The correct answer is: Does not belongs to the 95% con dence interval.
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