386 Chapter 8 Confidence Intervals USING TECHNOLOGY We use Example 8.14 to illustrate the technology steps. TI-84 PLUS Constructing a confidence interval for a proportion Step 1. Press STAT and highlight the TESTS menu. Step 2. Select 1–PropZInt and press ENTER (Figure A). The 1–PropZInt menu appears. Step 3. Enter the values of x and n. For Example 8.14, we use x = 403 and n = 517. Step 4. In the C-Level field, enter the confidence level. For Example 8.14, we use 0.95 (Figure B). Step 5. Highlight Calculate and press ENTER (Figure C). Note: The preceding steps produce the traditional confidence interval. To produce the small-sample interval, enter the value of x + 2 for x and the value of n + 4 for n. Figure A Figure B Figure C MINITAB Constructing a confidence interval for a proportion Step 1. Click on Stat, then Basic Statistics, then 1 Proportion. Step 2. Click Summarized Data and enter the value of n in the Number of trials field and the value of x in the Number of events field. For Example 8.14, we use x = 403 and n = 517 (Figure D). Step 3. Click Options and enter the confidence level in the Confidence Level (95) field. Click OK. Step 4. Click OK (Figure E). Note: The preceding steps produce the traditional confidence interval. To produce the small-sample interval, enter the value of x + 2 for x and the value of n + 4 for n. Figure D Figure E
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