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Home Q & A Board Science-Related Homework Help Psychology
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lorenlauu lorenlauu
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6 years ago
A researcher who is evaluating the significance of a multiple regression equation with two predictor variables obtains an F-ratio with df = 2, 18. How many individuals were needed to produce the sample data used to find the regression equation?
 
  A) 18
  B) 19
  C) 20
  D) 21

Question 2

Which of the following accurately describes the effect of increasing the sample size?
 
  A) Increases the standard error and has no effect on the risk of a Type I error
  B) Decreases the standard error and has no effect on the risk of a Type I error
  C) Increases the risk of a Type I error and has no effect on the standard error
  D) Decreases the risk of a Type I error and has no effect on the standard error

Question 3

The Pearson correlation between X1 and Y is r = 0.40 and SSY = 100. When a second variable, X2, is added to the regression equation, we obtain R2 = 0.25. How much additional variability is contributed by adding the second variable as a predictor compared to using X1 alone?
 
  A) 9 points
  B) 15 points
  C) 25 points
  D) 40 points
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ANGIEYQANGIEYQ
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#1
Posts: 300
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6 years ago
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lorenlauu Author
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6 years ago
You make an excellent tutor!
big_larry_samp
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Yesterday
Thanks
wyq2651
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2 hours ago
Thank you, thank you, thank you!
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