Data on fifth-grade test scores (reading and mathematics) fo
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Data on fifth-grade test scores (reading and mathematics) for 400 school districts in California yield Y = 712.1 and sta
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Data on fifth-grade test scores (reading and mathematics) for 400 school districts in California yield Y = 712.1 and standard deviation sY = 23.2. a. Construct a 90% confidence interval for the mean test score in the population. b. When the districts were divided into districts with small classes (6 20 students per teacher) and large classes (? 20 students per teacher), the following results were found: Is there statistically significant evidence that the districts with smaller classes have higher average test scores? Explain.
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