Data on fifth grade test scores (reading and mathematics) for 434 school districts in California yield Y 678 5 and standard deviation sy 20 5 The 95 confidence interval for the mean test score in the population is (676 58, 680 42) (Round your responses to two decimal places ) When the districts were divided into districts with small classes ( 20 students per teacher) and large classes ( 20 students per teacher), the following results were found Class Size Average Score (V) Standard Deviation (sy) 690 3 20 4 682 5 18 8 Small Large n 235 187 Is there statistically significant evidence that the districts with smaller classes have higher average test scores The t statistic for testing the null hypothesis is (Round your response to two decimal places )

Question: Data on fifth-grade test scores (reading and mathematics) for 434 school districts in California yield Y = 678.5 and standard deviation sy = 20.5.

Data on fifth-grade test scores (reading and mathematics) for 434 school districts in California yield Y = 678.5 and standard deviation sy = 20.5. The 95% confidence interval for the mean test score in the population is (676.58, 680.42). (Round your responses to two decimal places.) When the districts were divided into districts with small classes (

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