Data on fifth-grade test scores (reading and mathematics) for 423 school districts in California yield Y=639.7 and stand

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Data On Fifth Grade Test Scores Reading And Mathematics For 423 School Districts In California Yield Y 639 7 And Stand 1 (29.62 KiB) Viewed 29 times

Data on fifth-grade test scores (reading and mathematics) for 423 school districts in California yield Y=639.7 and standard deviation sy = 19.3. The 95% confidence interval for the mean test score in the population is (637.86, 641.54). (Round your responses to two decimal places). When the districts were divided into districts with small classes (<20 students per teacher) and large classes (220 students per teacher), the following results were found: Class Size Small Large Average Score (V) 650.8 643.5 Standard Deviation (sy) 19.2 17.7 n 247 182 Is there statistically significant evidence that the districts with smaller classes have higher average test scores? The I-statistic for testing the null hypothesis is 4.07. (Round your response to two decimal places.) The p-value for the test is 0.00 (Round your response to six decimal places) Hint: Use the Excel function Norm.S.Dist to help answer this question.