Use the data from Example 8.11 involving citizens opinions about a bond proposal, reproduced here. Find 99%
Question:
Use the data from Example 8.11 involving citizens opinions about a bond proposal, reproduced here.
Find 99% confidence intervals for the proportion in the developing section favoring the proposal, and for the difference in the proportions favoring the proposal for the two sections of the city. 1. Select Stat ➤ Basic Statistics and either 1 Proportion or 2 Proportions and select Summarized data in the top drop-down list. Enter the values for x and n (or x1, n1, x2, and n2) in the appropriate boxes. 2. In the Options dialog box, change the confidence level to 99. For 1 Proportion change the Method to “Normal approximation” and for 2 Proportions change the Test method to “Estimate the proportions separately.” Click OK twice. The 99% confidence intervals for p1 and for p p 1 2 2 are shown in Figures 8.13
(a) and 8.13(b).
Transcribed Image Text:
Developing Section Rest of the City Sample Size 50 Number Favoring Proposal 38 100 65
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