Quick Review Of Some Inference For Linear Regression Concepts
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How do you know that you should attempt to use a linear regression method for predicting y values from x values?
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When the moon is full.
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When Mrs. Linner gives you the evil eye.
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When the data look linear when graphed in a scatterplot.
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When the relationship should (theoretically) be linear.
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Either C or D will suffice.
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Inference and modeling concepts for AP Statistics students
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- 2.
When do you know that the model is a close fit to the data?
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When I flip a coin and it lands heads up.
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When I have run out of other models to try.
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When the r^2 value is close to 1.
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When the graph of the residuals(x, y - y-hat)forms a straight line.
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When the residuals(x, y - y-hat)are small and scattered(no pattern).
Correct Answer
A. When the r^2 value is close to 1. -
- 3.
When is the relationship between x and y too strong to assume that the slope of the best fit line (Beta) is possibly zero?
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When the confidence interval for the slope does not contain the value 0.
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When the p value of the linear regression t-test is very small.
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When the residuals are small and scattered.
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When the r^2 value is close to 1
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Answers A or B will suffice.
Correct Answer
A. Answers A or B will suffice. -
- 4.
Given b and SE of b you still need to know _______________ to calculate the t-statistic and the p-value.
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R
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N
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Df
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A
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B or C
Correct Answer
A. B or C -
- 5.
Given s, sx, and n you can calculate
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Beta
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Alpha
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B
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R
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SE of b
Correct Answer
A. SE of b -
- 6.
How do you know that your linear model was a wise choice (the linear model is the correct model)?
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When I flip a coin and it lands heads up.
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When I have run out of other models to try.
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When the r^2 value is close to 1.
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When the graph of the residuals(x, y - y-hat)forms a straight line.
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When the residuals(x, y - y-hat)are small and scattered(no pattern).
Correct Answer
A. When the residuals(x, y - y-hat)are small and scattered(no pattern). -
- 7.
Given r, sx, and sy you can calculate
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Beta
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Alpha
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B
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S
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SE of b
Correct Answer
A. B -
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Mar 22, 2022Quiz Edited by
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Apr 30, 2007Quiz Created by
Linnerstats
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