Answer Happy

Part 2 of 4 Data on fifth-grade test scores (reading and mathematics) for 428 school districts in California yield Y = 672.0 and standard deviation sy = 20.3. The 95% confidence interval for the mean test score in the population is (670.10, 673.93). (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) 683.7 676.0 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.) Standard Deviation (sy) 20.2 18.6 n 234 185