![]() You will spend the next several sections learning about how to compare sets of categorical and numerical data, including data that is both discrete and continuous. Also, since a box-and-whisker plot analyzes individual data points, we know that the data must be discrete, and not continuous. Stem-and-leaf plots are helpful when you need to organize data that spans a large range, or data that needs to be organized by place value. Does the following graph represent categorical or numerical data? Is the data discrete or continuous?īox-and-whisker plots are considered numerical displays of data, as they are based on quantitative data (the mean and median), as well as the maximum (upper) and minimum (lower) values found in the data. Line graphs, frequency polygons, histograms, and stem-and-leaf plots all involve numerical data, or quantitative data, as is shown in the remaining graphs.Ģ. Therefore, when you talk about discrete and continuous data, you are talking about numerical data. Numerical data involves measuring or counting a numerical value. ![]() The top 2 graphs are examples of categorical data represented in these types of graphs. Graphs such as pie charts and bar graphs show descriptive data, or qualitative data. These data forms are more qualitative data and, therefore, are less numerical than they are descriptive. These are data forms that are in categories and describe characteristics, or qualities, of a category. Categorical data forms are just what the term suggests. Which of the following graphs represent categorical, or qualitative, data? Which represent numerical, or quantitative, data?Ģ newer terms used are the categorical and numerical data forms. Recognizing the Type of Data Graphs Representġ. Bar graphs are especially useful when categorical data is being used.\) Since ' 9 ' (in the Econ 101 list) has no tens digit, the stem value will be ' 0 '. Some bar graphs present bars clustered in groups of more than one (grouped bar graphs), and others show the bars divided into subparts to show cumulative effect (stacked bar graphs). Since the values are similar, I can plot them all on one stem-and-leaf plot by drawing leaves on either side of the stem I will use the tens digits as the stem values, and the ones digits as the leaves. One axis of the chart shows the specific categories being compared, and the other axis represents a discrete value. A bar graph is a chart that uses either horizontal or vertical bars to show comparisons among categories. That is, finding a general pattern in data sets including temperature, sales, employment, company profit or cost over a period of time. These graphs are useful for finding trends. A line graph is often used to represent a set of data values in which a quantity varies with time. The advantage in a stem-and-leaf plot is that all values are listed, unlike a histogram, which gives classes of data values. In a stem-and-leaf plot, all data values within a class are visible. The frequency points are connected using line segments.Ī stem-and-leaf plot is a way to plot data and look at the distribution. In the particular line graph shown in (Figure), the x-axis (horizontal axis) consists of data values and the y-axis (vertical axis) consists of frequency points. LossesĪnother type of graph that is useful for specific data values is a line graph. Create a side-by-side stem-and-leaf plot of these wins and losses. ![]() The table shows the number of wins and losses the Atlanta Hawks have had in 42 seasons. Presidential Ages at Inauguration President
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