Data from the health promotion study described in the textbook were first arranged in a frequency distribution. The researchers then graphically displayed the data in a bar chartwith vertical bars that touched. At that point, the researchers had constructed a:

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A histogram is a graphical display of data that uses bars to represent the frequency distribution of a set of continuous data. In this case, the health promotion study data was arranged in a frequency distribution and displayed in a bar chart with vertical bars that touched, indicating a histogram. A frequency polygon is another graphical display of data that uses lines to connect the midpoints of the bars in a histogram, which was not mentioned in the question. A scatter plot is used to display the relationship between two continuous variables, so it is not relevant to this question. A means table is a tabular representation of the mean values of different groups in a study, which was also not mentioned in the question.

Data from the Health Promotion Study Described in the Textbook