Table 11

Descriptive Statistics of Treatment Classes and Survey Sample

	Treatment Classes			Random Sample			Mean Differences
Variables	Mean	SD	N	Mean	SD	N	Mean Differences
Cognitive Skills
Standardized baseline scores	−0.001	0.991	791	−0.004	1.005	73	0.003
Noncognitive Skills
Openness	0.015	1.019	728	−0.031	0.881	73	0.065
Conscientiousness	0.112	1.054	728	0.062	0.795	73	0.051
Extraversion	0.067	1.074	728	0.085	0.957	73	−0.018
Agreeableness	−0.074	1.087	728	−0.174	0.933	73	0.100
Neuroticism	0.116	1.047	728	0.094	0.868	73	0.022
Individual Characteristics
Gender	0.568	0.496	790	0.589	0.495	73	−0.021
Age	9.501	1.070	790	9.521	1.042	73	−0.020
Height	135.306	11.621	790	135.658	8.39	73	−0.352
Grade	4.006	0.821	790	3.986	0.842	73	0.020
School	3.061	1.448	790	3.123	1.443	73	−0.063

Data source: Experiment data.
Notes: Cognitive skills and noncognitive skills are standardized to have a mean of zero and SD of one.