There are many ways to measure the reading ability of children. Research designed toimprove reading performance is dependent on good measures of the outcome. Onefrequently used test is the DRP, or Degree of Reading Power. A researcher suspects that themean score µ of all third- graders in Henrico County Schools is different from the nationalmean, which is 32. To test her suspicion, she administers the DRP to an SRS of 44 HenricoCounty third-grade students. The distribution of scores is summarized in the Minitab outputbelow: MEAN STDEV SEMEAN MIN Q1 MEDIAN Q3MAXDRP 35.09 11.19 1.69 14.00 26.00 35.00 44.0054.00 Construct a 90% confidence interval to estimate the mean DRP score in Henrico CountySchools.
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, 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
MAX
DRP 35.09 11.19 1.69 14.00 26.00 35.00 44.00
54.00
Construct a 90% confidence
Schools.
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