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. it is known that the distribution of drp scores is normally distributed. a researcher suspects that the mean score µ 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 a random sample of 22 henrico county third-grade students. their scores were 40 26 39 17 42 18 24 43 46 27 19 47 19 26 37 34 15 45 41 39 31 46