12. There are many ways to measure the reading ability of children. Research designed to improve reading performance is dependent on good measures of the outcome. One frequently used test is the DRP, or Degree of Reading Power. A researcher suspects that the mean score u of all third- graders in Henrico County Schools is different from the national mean, which is 32. To test her suspicion, she administers the DRP to an SRS of 44 Henrico County third-grade students. The distribution of scores is summarized in the Minitab output below: MEAN STDEV SEMEAN MIN Q1 MEDIAN Q3 MAX DRP 35.09 11.19 1.69 14.00 26.00 35.00 44.00 54.00 (a) Construct a 90% confidence interval to estimate the mean DRP score in Henrico County Schools