How does a bubble graph differ from a traditional scatterplot? The type of graph

Question

How does a bubble graph differ from a traditional scatterplot? The type of graph for the effects of cognitive behavioral therapy on depression: A social worker tracked the depression levels of clients being treated with cognitive-behavioral therapy for depression. For each client, depression was assessed at weeks 1 to 20 of therapy. She calculated a mean for all of her clients at week 1, week 2 and so on, all the way to week 20. What are the independent variables in this study? Are the variables nominal, ordinal, or scale? Which graph or graphs would be the most appropriate to depict the data? Explain why.

Explanation / Answer

Traditional scatterplot is used to represent two-dimensional data, whereas, bubble graph can represent three different dimensions of data. The size of the bubbles is proportional to the value.

Here the independent variable is the cognitive behavioral therapy and the dependent variable is depression levels. (Ans).

Depression level is ordinal. (Ans).

Here we can use bubble chart with weeks on the x-axis, depression levels on the y-axis and size of the bubbles represent the number of clients. (Ans).

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