Mathematics, 15.04.2020 20:12 dondre54
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 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 an SRS of 44 Henrico County third-grade students and the standard deviation of scores in Henrico County Schools is known to be σ = 11 Their scores were: 40 26 39 14 42 18 25 43 46 27 19 47 19 26 35 34 15 44 40 38 31 46 52 25 35 35 33 29 34 41 49 28 42 47 35 48 22 33 41 51 27 14 54 45
a. Construct a 90% confidence interval to estimate the mean DRP score in Henrico County Schools.
b. Use the confidence interval you constructed in part (a) to comment on whether you agree with the researcher’s claim. Explain your reasoning clearly.
Answers: 1
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There are many ways to measure the reading ability of children. Research designed to improve reading...
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