Chapter 9, Problem 4CQQ

In Exercises 1-5, use the following survey results: Randomly selected subjects were asked if they were aware that the Earth has lost half of its wildlife population during the past 50 years. Among 1121 women, 23% said that they were aware. Among 1084 men, 26% said that they were aware (based on data from a Harris poll).

4. Biodiversity When using the given sample data to construct a 95% confidence interval estimate of the difference between the two population proportions, the result of (-0.0659, 0.00591) is obtained from technology.

a. Express that confidence interval in a format that uses the symbol <.

b. What feature of the confidence interval is a basis for deciding whether there is a significant difference between the proportion of women aware of the statement and the proportion of men who are aware?