48 CHAPTER 2 Descriptive Statistics If you have access to technology such as Minitab, Excel, StatCrunch, or the TI-84 Plus, you can use it to draw the graphs discussed in this section. Using Technology to Construct Histograms Use technology to construct a histogram for the frequency distribution in Example 2. SOLUTION Using the instructions for a TI-84 Plus shown in the Tech Tip at the left, you can draw a histogram similar to the one below on the left. To investigate the graph, you can use the trace feature. After pressing TRACE, the midpoint and the frequency of the first class are displayed, as shown in the figure on the right. Use the right and left arrow keys to move through each bar. TI-84 PLUS TI-84 PLUS min=172.5 max<208.5 n=3 Plot:L1,L2 Histograms made using Minitab, Excel, and StatCrunch are shown below. MINITAB Frequency 1 0 3 2 4 5 6 7 172.5 208.5 244.5 280.5 316.5 352.5 388.5 Times (in minutes) EXCEL Frequency 1 0 3 2 4 5 6 7 172.5 208.5 244.5 280.5 316.5 352.5 388.5 Times (in minutes) STATCRUNCH 1 0 3 2 4 5 6 7 8 155 191 227 263 299 335 371 407 Times (in minutes) TRY IT YOURSELF 7 Use technology and the frequency distribution from Try It Yourself 2 to construct a frequency histogram that represents the points scored by the 55 winning teams listed on page 39. Answer: Page A36 EXAMPLE 7 Tech Tip You can use technology such as Minitab, Excel, StatCrunch, or the TI-84 Plus to create a histogram. (Detailed instructions for using Minitab, Excel, and the TI-84 Plus are shown in the technology manuals that accompany this text.) For instance, here are instructions for creating a histogram on a TI-84 Plus. STAT ENTER Enter midpoints in L1. Enter frequencies in L2. 2nd STAT PLOT Turn on Plot 1. Highlight Histogram. Xlist: L1 Freq: L2 ZOOM 9
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