Table 1: Differences Estimates of Effect on Standardized Test Scores of Class Size Treatment Group Grade Regressor Small class Regular size with aide K 13.45** (2.43) 0.31 (2.27) 918.04** (1.63) 5786 1 29.88** (2.86) 11.96 (2.65) 1039.39** (1.78) 6379 2 19.43** (2.73) 3.48 (2.54) 1157.81** (1.82) 6049 3 15.71** (2.38) -0.29 (2.27) 1228.51** (1.68) 5967 Intercept Number of observations Note: The dependent variable is the student's combined score on the math and reading portions of an achievement test. Standard errors are given in parentheses under the coefficients. ** The individual coefficient is statistically significant at the 1% significance level using a two-sided test. Using the results in the table above, calculate the following for each grade: an estimate of the small class treatment effect, relative to the regular class; its standard error; and its 95% confidence interval. (For this exercise, ignore the results for regular classes with aides.) For students in kindergarten: The estimated small class treatment effect relative to being in a regular class is an increase of points on the test. Standard error = (Round your response to two decimal places.) The 95% confidence interval=(.). (Round your responses to two decimal places.) (Round your response to two decimal places.)

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