The Pew Research Center reports on a survey taken in late 2013 in which they asked whether respondents have heard “good news” about the job market. They compared those making $30,000 or less per year with those making between $31,000 and $74,000. We’ll label the population of those making less than $30,000 as population 1 (low income), and those making between $31,000 and $74,000 as population 2 (middle income). A 95% confidence interval for the difference in proportions, 1 (low) minus 2 (middle), is (-0.08 to 0.02). Interpret this confidence interval. If the interval contains 0, indicate what this means. Explain the meaning of positive and/or negative values.
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