98 CHAPTER 3 Describing, Exploring, and Comparing Data Descriptive Statistics Access tech supplements, videos, and data sets at www.TriolaStats.com TECH CENTER 1. Click Data in the top menu. 2. Select Explore Data- Descriptive Statistics from the dropdown menu. 3. Select the desired data column. 4. Click Evaluate to view descriptive statistics. Statdisk 1. Click Stat in the top menu. 2. Select Basic Statistics from the dropdown menu, and then select Display Descriptive Statistics. 3. Double click on the desired data column so that it appears in the Variables window. 4. Click OK to view descriptive statistics. TIP: Click the Statistics button above OK to select individual statistics you want displayed. Minitab 1. Click on Stat in the top menu. 2. Select Summary Stats from the dropdown menu, then select Columns. 3. Select the desired data column. 4. Click Compute! to view descriptive statistics. TIP: Customize descriptive statistics by selecting items under Statistics. StatCrunch XLSTAT Add-In 1. Click on the XLSTAT tab in the Ribbon, and then click Describing Data. 2. Select Descriptive statistics from the dropdown menu. 3. Check the Quantitative data box and enter the desired data range. If the first row of data contains a label, also check the Variable labels box. 4. Click OK to view descriptive statistics. TIP: Click the Outputs tab to select which statistics are shown. Excel Data Analysis Add-In 1. Click on the Data tab in the Ribbon, and then select Data Analysis in the top menu. 2. Select Descriptive Statistics under Analysis Tools. 3. Enter the desired data range for Input Range. If the first row of data contains a label, also check the Labels in First Row box. 4. Check the Summary Statistics box and click OK to view descriptive statistics. Excel 1. Press K, then select CALC from the top menu. 2. Select 1-Var Stats and press [. 3. Enter the name of list that includes the desired data (e.g., L1). 4. Select Calculate and press [ to view descriptive statistics. TIP: Press e to view additional statistics that don't fit on the initial screen. TI-83, 84 Plus Calculator R commands: Mean, 5-Number Summary: summary(x) Standard Deviation: sd(x) Variance: var(x) A complete list of R statistical commands is available at TriolaStats.com R Statistical Literacy and Critical Thinking 1. Average The Social Security Administration lists “the national average wage index” for a recent year as 50,321.89. What is the role of the term average in statistics? Should another term be used in place of average? 2.What’s Wrong? Education Week magazine published a list consisting of the mean teacher salary in each of the 50 states for a recent year. If we add the 50 means and then divide by 50, we get $56,479. Is the value of $56,479 the mean teacher salary for the population of all teachers in the 50 United States? Why or why not? 3.Measures of Center In what sense are the mean, median, mode, and midrange measures of “center”? 4.Resistant Measures Listed below are 10 wait times (minutes) for “Rock ‘n’ Roller Coaster” at 10 AM (from Data Set 33 “Disney World Wait Times”). The data are listed in order 3-1 Basic Skills and Concepts
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