(Analysis of Reports of Unidentified Aerial Objects)

Approved For Release 2005/07/20 : CIA-RDP81R00560R000100060001-5 --- TABLE XIII CHI SQUARE TEST OF REVISED KNOWNS VERSUS UNKNOWNS ON THE BASIS OF LIGHT BRIGHTNESS Light Brightness Number of KNOWNS Adjusted $\frac{X^2, (K-n)^2}{K}$ Number of KNOWNS (K) Number of UNKNOWNS (n) Sunlight on mirror 24 8 14 2.67 Sunlight on aluminum 136 46 28 Sunlight on plaster, stone, or soil 63 21 16 1.19 Brighter than moon 143 48 61 3.52 Like moon or duller than moon 42 15 22 3.27 Not stated 878 296 293 0.03 Total 1286 434 434 10.68 Degrees of freedom 4 5% 9.5 1% 13.3 --- 75 Approved For Release 2005/07/20 : CIA-RDP81R00560R000100060001-5