TABLE 1-SCHOOL AND CLASS CHARACTERISTICS, BY TREATMENT GROUP, PRE- AND POST-PROGRAM START All ETP schools p-value Nontracking Tracking tracking = schools schools nontracking Mean SD Mean SD Panel A. Baseline school characteristics Total enrollment in 2004 589 232 549 198 0.316 Number of government teachers in 2004 11.6 3.3 11.9 2.8 0.622 School pupil/teacher ratio 37.1 12.2 35.9 10.1 Performance in national exam in 2004 0.557 255.6 23.6 258.1 23.4 0.569 (out of 400) Within tracking schools Assigned to Assigned to p-value bottom section top section top = bottom Mean SD Mean SD Panel E. Comparability of two sections within tracking schools Proportion female 0.49 0.09 0.50 0.08 0.38 Average age at endline 9.04 0.59 9.41 0.60 0.00 Average standardized baseline score -0.81 0.04 0.81 0.04 0.00 (mean 0, SD 1 at school level) Average SD within section in 0.49 0.13 0.65 0.13 0.00 standardized baseline scores Assigned to contract teacher 0.53 0.49 0.46 0.47 0.441. (8 points) Examine the difference in baseline means and the p-values in Table 1. Explain why some of these are significant and some of these are not significant. Do these values support or cast doubt on the internal validity of this RCT