. Author manuscript; available in PMC: 2013 Jan 1.

Published in final edited form as: B E J Econom Anal Policy. 2012 Jan 31;12(1):Article 3. doi: 10.1515/1935-1682.2599

Appendix Table 1.

Sample Means of Standardized AFQT by High School Graduation Cohort

High School Graduation Year	Mean	Std error	Significantly different from:
1975	0.296	0.051	1976^, 1983^*
1976	0.115	0.048	1977^, 1980^, 1982^, 1983^***
1977	0.231	0.047	1983^***
1978	0.208	0.048	1983^***
1979	0.183	0.046	1983^***
1980	0.278	0.043	1983^***
1981	0.183	0.049	1983^***
1982	0.236	0.052	1983^***
1983	-0.543	0.129	-

Significance levels are from t-tests of differences in means for the specified years

significant at 10%,

^**

significant at 5%,

^***

significant at 1%