Project Blue Book Special Report No. 14 (Analysis of Reports of Unidentified Aerial Objects)

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TABLE XIII
CHI SQUARE TEST OF REVISED KNOWNS VERSUS
UNKNOWNS ON THE BASIS OF LIGHT BRIGHTNESS
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Adjusted
x2,
Number of
Number of
Number of
(K-n) 2
Light Brightness
KNOWNS
KNOWNS (K)
UNKNOWNS ( n)
K
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Sunlight on mirror
24
8
14}
2.67
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Sunlight on aluminum
136
46
28
Sunlight on plaster,
63
21
16
1. 19
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stone, or soil
Brighter than moon
143
48
61
3.52
Like moon or duller
42
15
22
3. 27
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than moon
Not stated
878
296
293
0.03
Total
1286
434
434
10.68
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Degrees of freedom
4
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5%
9.5
1%
13. 3
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75
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