Histograms Access tech supplements, videos, and data sets at www.TriolaStats.com TECH CENTER continued TI-83, 83 84 Plus Calculator 8 us Ca cu ato 1. Open the STAT PLOTS menu by pressing F, E. 2. Press [ to access the Plot 1 settings screen as shown: a. Select ON and press [. b. Select the bar chart option, then press [. c. Enter the name of list containing data. 3. Press B, then 9 (ZoomStat) to generate the default histogram. 4. Press C and use fg to view the class boundaries and frequencies for each class. 5. Press A to customize class width and boundaries. Press D to view histogram. Tip: The list name L1 ( and L2 . . . L6) can be quickly entered by pressing F 1. 2-2 Histograms 59 Excel It is extremely difficult to generate histograms in Excel; the XLSTAT add-in should be used: 1. Select the XLSTAT tab in the Ribbon. 2. Click the Visualizing Data button. 3. Select Histograms from the dropdown menu. 4. Enter the range of cells containing the desired data. Click Variable labels if the first cell contains a data name. 5. Click OK to generate a default histogram. Tip: To customize, enter the desired class boundaries in a column, select the Options tab, click User Defined, and enter the range of cells containing the boundaries in the box. R R command: hist(x) A complete list of R statistical commands is available at TriolaStats.com Statistical Literacy and Critical Thinking 1.IQ Scores IQ scores of adults are normally distributed. If a large sample of adults is randomly selected and the IQ scores are illustrated in a histogram, what is the shape of that histogram? 2.More IQ Scores The population of IQ scores of adults is normally distributed. If we obtain a voluntary response sample of 5000 of those IQ scores, will a histogram of the sample be bellshaped? 3.Cell Phone Radiation Listed below are radiation levels (W>kg) from Samsung Galaxy cell phones (based on data from Samsung). Why does it not make sense to construct a histogram for this data set? 0.87 1.18 1.47 1.25 1.59 1.55 4.Cell Phone Radiation If we collect a sample of cell phone radiation amounts much larger than the sample included with Exercise 3, and if our sample includes a single outlier, how will that outlier appear in a histogram? 2-2 Basic Skills and Concepts
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