The correlation coefficient r is a descriptive statistic
Indicate whether the statement is true or false
T
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Which of the following is true? a. When regression to the mean occurs, the scores of the entire sample tend to become more similar over time. b. When regression to the mean occurs, participants who score at the extremes of the distribution tend to become less extreme when tested a second time
c. When regression to the mean occurs, participants whose scores are close to the mean tend to receive lower scores when tested a second time. d. When regression to the mean occurs, participants whose scores are close to the mean tend to receive higher scores when tested a second time.
What does the third-variable problem indicate?
A) The three variables are all causally related to one another; each is a cause of the others. B) The correlation between any two of the variables must be established before another correlation can be computed. C) Two of the variables are correlated with each other only because each is causally related to a third variable. D) Changes in one variable are producing changes in another variable.
In her classroom, Kim and small groups of students take turns leading dialogues on the content of various texts. This is an example of
A) cooperative learning. B) reciprocal teaching. C) scaffolding. D) guided participation.
A researcher designs an experiment by manipulating the weight of an individual (normal, over), age (young, middle, old), and gender (male, female). How many interactions are possible?
A. 18 B. 2 C. 3 D. 4