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

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TABLE X
CHI SQUARE TEST OF REVISED KNOWNS VERSUS
UNKNOWNS ON THE BASIS OF SHAPE
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x2
Adjusted
'
Number of
Number of
Number of
(K-n) 2
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Shape
KNOWNS
KNOWNS (K)
UNKNOWNS. ( n)
K
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Elliptical
632
213
195
1. 52
Rocket or aircraft
72
24
33
3.37
Meteor or comet
9
3
1.32
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Flame
47
16
1~}
Teardrop, lenticular,
79
27
22
0.93
or conical
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Other
151
51
54
1. 76
Not stated
296
100
116
2.56
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Total
1286
434
434
11.46
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Degrees of freedom
5
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5%
11. 1
1%
15. 1
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I!
72
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