Volunteers for a research study were divided into three groups.Group 1 listened to Western religious music,Group 2 listened to Western rock music,and Group 3 listened to Chinese religious music.The blood pressure of each volunteer was measured before and after listening to the music,and the change in blood pressure (blood pressure before listening minus blood pressure after listening)was recorded. What could we do to explore the relationship between type of music and change in blood pressure?
A)See if blood pressure decreases as type of music increases by examining a scatterplot.
B)Make a histogram of the change in blood pressure for all of the volunteers.
C)Make side-by-side boxplots of the change in blood pressure,with a separate boxplot for each group.
D)All of the above

Question

Quizplus · Accepted Answer

Making side-by-side boxplots of the change in blood pressure for each group allows for easy comparison between the effects of different types of music on blood pressure. A scatterplot would not be appropriate as there are three categorical groups and only one continuous variable. A histogram would not distinguish between the different groups and their respective music types.

Volunteers for a Research Study Were Divided into Three Groups