7. Data on fifth-grade test scores (reading and mathematics) for 436 school districts in California yield Y = 620.4 and standard deviation sy = 18.7. The 95% confidence interval for the mean test score in the population is ( 618.64 (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: Average Score (Y) 631.1 624.0 Class Size Small Large The (1) Hence, (3) average test scores. Standard Deviation (sy) (1) O small p-value O large p-value 18.6 17.2 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 4.02 . (Round your response to two decimal places.) (Round your response to six decimal places.) Hint: Use the Excel can be rejected O cannot be rejected The p-value for the test is function Norm.S.Dist to help answer this question. Is there statistically significant evidence that the districts with smaller classes have higher average test scores? 622.16 ). n (3) there is 234 181 suggests that the null hypothesis (2) with a high degree of confidence. statistically significant evidence that the districts with smaller classes have higher Othere is no

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