A scatterplot shows a set of data points that are clustered very close to a line that slopes down from the upper left corner to the bottom right corner

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A scatterplot shows a set of data points that are clustered very close to a line that slopes down from the upper left corner to the bottom right corner. Which of the following values would be closest to the correlation for these data?

  -0.20 

  -0.80 

  +0.20 

  +0.80 

Which of the following is a characteristic of a correlational study? In other words, which is a characteristic of a non-experiment?

  participants are randomly assigned to groups 

  participants receive some sort of treatment or intervention 

  none of the other options is a characteristic of a correlational study 

For the following data, r equals ____.

 Hint: Use a spreadsheet and the =PEARSON() formula.

X

2

4

5

2

Y

3

5

2

5

  -0.75 

  -0.83 

  1 

  0.75 

Dr. Huitema reported the results of a test on Pearson's r as r(50) = .40, p = .003, two-tailed. If he set alpha = .05, what decision should did he make about the null hypothesis?

  Fail to reject 

  Not enough information to decide. 

  Reject 

For which of the following correlations would the data points be clustered most closely around a straight line?

  There is no relationship between the correlation and how close the data points are to the line. 

  r = 0.10 

  r = -0.85 

  r = 0.50 

A linear regression equation has b = 2 and a = 3. What is the predicted value of Y (called "Y-hat") for X = 8?

  Y-hat = 26 

  cannot be determined without additional information 

  Y-hat = 19 

  Y-hat = 5