Aresearch center reports on a survey taken 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 $ 31000 and $ 74000 as population 2 (middle income). a 99% confidence interval for the difference in proportions, 1 (low) minus 2 (middle) is (- 0.02, 0.09 ). interpret this confidence interval. if the interval contains 0, indicate what this means. explain the meaning of positive and/or negative values.