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

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TABLE VII
CHI SQUARE TEST OF 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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'
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Sunlight on mirror
47
11
14
0.82
Sunlight on aluminum
151
37
28
2. 19
Sunlight on plaster,
76
19
16
0.47
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stone, or soil
Brighter than moon
273
67
61
0.55
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Like moon or duller
68
17
22
1. 47
than moon
Not stated
1150
283
293
0.35
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Total
1765
434
434
5.85
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Degrees of freedom
5
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5%
11. 1
1%
15. 1
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67
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