Problem 6s.23 The school board is trying to evaluate a now math program introduc

Question

Problem 6s.23 The school board is trying to evaluate a now math program introduced to second gradars in five elermentary schools across the county this yeai A sample af the student scores on standardized math yielded the following data No. of Test Errors r5 38 42 47 61 For the test errors, the chart with control linnts that cortan 99 73% of the random vanaton in test scores s: UCL-errors (round your response to two decimal places) Enter your answer in the answer box and then click Check Answer Clear All parts O Type here to search

Explanation / Answer

School No of Test Errors A 75 B 38 C 42 D 47 E 61 Total 263 Sample 5 Mean 52.6 Square Root 7.2525857 Control limits = mean of defects per unit ± 3 x square root of mean of defects per unit UCL = mean # of defects per unit + 3 x square root of mean # of defects per unit UCL = 74.36 or 74.35

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