EXAMPLE 19 intervals for using technology

A Pew Research Center survey of 1895 Internet users found 1118 who agree that “online dating is a good way to meet people.” Use technology to find a 95% confidence interval for the population proportion of all Internet users who agree that online dating is a good way to meet people.

Solution

We use the instructions provided in the Step-by-Step Technology Guide at the end of this section (page 469). The results for the TI-83/84 in Figure 28 display the 95% confidence interval for the population proportion of Americans who agree that online dating is a good way to meet people to be

image
Figure 8.28: FIGURE 28 TI-83/84 results.

They also show the sample proportion and the sample size .

466

The results for Minitab are shown in Figure 29. Minitab provides the sample number of successes , the sample size , the sample proportion , and the 95% confidence interval for .

image
Figure 8.29: FIGURE 29 Minitab results for the interval for .

The results for CrunchIt! are shown in Figure 30. CrunchIt! provides the sample size , the sample number of successes , the sample proportion , and the 95% confidence interval for .

image
Figure 8.30: FIGURE 30 CrunchIt! results for the interval for .