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D - Distribution Stem and Leaf Displays Author(s) David M. Lane Prerequisites Distributions Learning Objectives Create and interpret basic stem and leaf displays Create and interpret back-to-back stem and leaf displays Judge whether a stem and leaf display is appropriate for a given data set A stem and leaf display is a graphical method of displaying data. Table 1. A stem and leaf display of the data is shown in Figure 1. Figure 1. To make this clear, let us examine Figure 1 more closely. One purpose of a stem and leaf display is to clarify the shape of the distribution. We can make our figure even more revealing by splitting each stem into two parts. Figure 2. Figure 2 is more revealing than Figure 1 because the latter figure lumps too many values into a single row. There is a variation of stem and leaf displays that is useful for comparing distributions. Figure 3. Figure 3 helps us see that the two seasons were similar, but that only in 1998 did any teams throw more than 40 TD passes. Table 2. Figure 4.

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D - Sample Size Calculator 1 This Sample Size Calculator is presented as a public service of Creative Research Systems survey software. You can use it to determine how many people you need to interview in order to get results that reflect the target population as precisely as needed. You can also find the level of precision you have in an existing sample. Before using the sample size calculator, there are two terms that you need to know. These are: confidence interval and confidence level. Enter your choices in a calculator below to find the sample size you need or the confidence interval you have. Sample Size Calculator Terms: Confidence Interval & Confidence Level The confidence interval (also called margin of error) is the plus-or-minus figure usually reported in newspaper or television opinion poll results. The confidence level tells you how sure you can be. Factors that Affect Confidence Intervals There are three factors that determine the size of the confidence interval for a given confidence level: Sample Size

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