A researcher is interested in if Dungeons and Dragons (DnD) reduces stress levels over time. They have 50 participants report their stress levels at 4 time points (before they start playing DnD, one week after they start playing, one month after they start playing, and one year after they start playing). The researcher obtained the sample using targeted ads for individuals who had recently purchased DnD dice or books. After collecting the sample, the researcher learns that 6 of the participants are in the same DnD game as at least one other participant (they play together regularly). The variability of the difference scores between time points is consistent across all time points. The distribution of stress scores is unimodal and symmetrical. What are three sources of variability? Which of the following statements is most relevant for the sphericity assumption? Group of answer choices a. They have 50 participants report their stress levels at 4 time points. b. After collecting the sample, the researcher learns that 6 of the participants are in the same DnD game as at least one other participant. c. The variability of the difference scores between time points is consistent across all time points. d. The distribution of stress scores is unimodal and symmetrical.
A researcher is interested in if Dungeons and Dragons (DnD) reduces stress levels over time. They have 50 participants report their stress levels at 4 time points (before they start playing DnD, one week after they start playing, one month after they start playing, and one year after they start playing). The researcher obtained the sample using targeted ads for individuals who had recently purchased DnD dice or books. After collecting the sample, the researcher learns that 6 of the participants are in the same DnD game as at least one other participant (they play together regularly). The variability of the difference scores between time points is consistent across all time points. The distribution of stress scores is unimodal and symmetrical.
What are three sources of variability?
Which of the following statements is most relevant for the sphericity assumption? Group of answer choices
a. They have 50 participants report their stress levels at 4 time points.
b. After collecting the sample, the researcher learns that 6 of the participants are in the same DnD game as at least one other participant.
c. The variability of the difference scores between time points is consistent across all time points.
d. The distribution of stress scores is unimodal and symmetrical.
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