![]() Bar graphs are especially useful when categorical data is being used. 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). 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. The parameter scale can be used to expand the scale of the. That is, finding a general pattern in data sets including temperature, sales, employment, company profit or cost over a period of time. This free online software (calculator) computes the Stem-and-leaf Plot for a univariate dataset. These graphs are useful for finding trends. Representing a quantitative variable with histograms and stem plots Reading stem and leaf plots AP.STATS: UNC1 (EU), UNC1.G (LO), UNC1.G. 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 Example, the x-axis (horizontal axis) consists of data values and the y-axis (vertical axis) consists of frequency points. It takes some background information to explain outliers, so we will cover them in more detail later.Īnother type of graph that is useful for specific data values is a line graph. For example, 543 and 548 can be displayed together on a stem and leaf as 54 3,8. ![]() The 'leaf' is on the right and displays the last digit. The 'stem' is on the left displays the first digit or digits. Some outliers are due to mistakes (for example, writing down 50 instead of 500) while others may indicate that something unusual is happening. A stem and leaf is a table used to display data. Therefore, a scale greater than 1 will increase the. When you graph an outlier, it will appear not to fit the pattern of the graph. To rescale the stemplot, change the scale argument of the function, stem( ). An outlier is an observation of data that does not fit the rest of the data. You want to look for an overall pattern and any outliers. Can you see how this graph was constructed table1.gif (6324 bytes). The stemplot is a quick way to graph data and gives an exact picture of the data. A stem-and-leaf plot of the income data for the countries in Western Africa is shown below. \right)\) were in the 90s or 100, a fairly high number of As.įor the Park City basketball team, scores for the last 30 games were as follows (smallest to largest):ģ2 32 33 34 38 40 42 42 43 44 46 47 47 48 48 48 49 50 50 51 52 52 52 53 54 56 57 57 60 61Ĭonstruct a stem plot for the data.
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