Question: To learn if there is a relationship between water consumption and headache frequency, people in a sample of young adults were asked how much water

To learn if there is a relationship between water consumption and headache frequency, people in a sample of young adults were asked how much water they drink in a typical day and how many days per month they experience a headache.
Answer the following three questions and then use Figure 2.2 to select an appropriate graphical display.
Question 1: How many variables are in the data set?
Question 2: Is the data set categorical or numerical?
Question 3: Would the purpose of a graphical display be to summarize the data distribution, to compare groups, or to investigate the relationship between two numerical variables?

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