![]() The completed stem‐and‐leaf for the high school students' test scores looks like Table 1. ![]() (Some stem‐and‐leafs do not include this running total.) Having a running total enables the reader to quickly locate the median. Note, too, that along the extreme left side of the chart is a vertical column that keeps a running count or total. The stem‐and‐leaf takes all but the last digit of each score as the stem and uses the remaining digit as the leaf.Īs an example, for the score of 69, the 6 is the stem and the 9 is the leaf for the next three grades (75, 77, and 79), 7 is the stem, and 5, 7, and 9 are the leaves. It is similar to a histogram in that it shows the range of data, where the data are concentrated, if there are any outliers (occasional extremely high or extremely low scores), and the general shape of the distribution.įor example, look at the following data-test scores of 17 high school students: 69, 75, 77, 79, 82, 84, 87, 88, 89, 89, 89, 90, 91, 93, 96, 100, and 100. Quiz: Test for Comparing Two ProportionsĪnother useful pictorial is the stem‐and‐leaf.Quiz: Test for a Single Population Proportion.Test for a Single Population Proportion.Quiz: Two-Sample t-test for Comparing Two Means.Two Sample t test for Comparing Two Means.Quiz: Two-Sample z-test for Comparing Two Means.Quiz: Introduction to Univariate Inferential Tests.Two-Sample z-test for Comparing Two Means. ![]()
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