Section 8.1 Confidence Intervals for a Population Mean, Standard Deviation Known 361 USING TECHNOLOGY We use Example 8.4 to illustrate the technology steps. TI-84 PLUS Constructing a confidence interval for the mean when �� is known Step 1. Press STAT and highlight the TESTS menu. Step 2. Select ZInterval and press ENTER (Figure A). The ZInterval menu appears. Step 3. For Inpt, select the Stats option and enter the values of ��, ̄x, and n. For Example 8.4, we use �� = 15, ̄x = 67.30, and n = 100. Step 4. In the C-Level field, enter the confidence level. For Example 8.4, we use 0.98 (Figure B). Step 5. Highlight Calculate and press ENTER (Figure C). Note that if the raw data are given, the ZInterval command may be used by selecting Data as the Inpt option and entering the location of the data as the List option (Figure D). Figure A Figure B Figure C Figure D MINITAB Constructing a confidence interval for the mean when �� is known Step 1. Click on Stat, then Basic Statistics, then 1-Sample Z. Step 2. Choose one of the following: ∙ If the summary statistics are given, click Summarized Data and enter the Sample Size (100), the Sample Mean (67.30), and the Standard Deviation (15) (Figure E). ∙ If the raw data are given, click Samples in Columns and select the column that contains the data. Enter the Standard Deviation. Step 3. Click Options and enter the confidence level in the Confidence Level (98) field. Click OK. Step 4. Click OK (Figure F). Figure E Figure F
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