Below you will find a portion of data from a study of the relationship between eating disorders and manic-depressive tendencies (Williams & Lester, 1996). A number of female college students were administered the ACHA (American College Health Association) eating disorders scale, as well as a questionnaire including six questions measuring manic-depressive tendencies. The six questions included items that had to be marked as true or false. An example of an item is ‘My mind has sometimes been so full of different ideas that I couldn’t keep my attention on one topic for very long’. Participants were awarded one point for each of the six items endorsed as true, which means that the participant’s manicdepressive scores could range from 0 (no items marked as true) to 6 (all six questions marked as true).
a) Make a hypothesis about the relationship between eating disorders (as measured by the ACHA) and manic-depres- sive tendencies (as measured by the six-item scale).
b) Create a scatterplot of the data and determine whether a linear relationship is applicable.
c) Calculate Pearson’s r for the data.
d) How strong is the relationship between the two variables in this study?
e) Is the relationship between the two variables positive or negative?
f) Was your hypothesis confirmed or disconfirmed by the data?
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