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

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TABLE IV
CHI SQUARE TEST OF KNOWNS VERSUS
UNKNOWNS ON THE BASIS OF SHAPE
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Adjusted
x2'
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Number of
Number of
Number of
{K-n} 2
Shape
KNOWNS
KNOWNS {K)
UNKNOWNS (n)
K
Elliptical
838
206
195
0.59
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Rocket and aircraft
80
20
33
8.45
Meteor or comet
55
14
4
7. 14
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Teardrop, lenticular,
103
25
22
0.36
or conical
Flame
96
24
10
8. 17
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Other
193
47
54
1.04
Not stated
400
98
116
3.30
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Total
1765
434
434
29.05
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Degrees of freedom
6
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5%
12.6
1%
16.8
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64
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