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

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TABLE XII
CHI SQUARE TEST OF REVISED KNOWNS VERSUS
UNKNOWNS ON THE BASIS OF SPEED
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x2
Adjusted
' 2
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Nu1nber of
Number of
Number of
(K-n}
Speed
KNOWNS
KNOWNS (K)
UNKNOWNS (n)
K
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Stationary
196
66
53
2.56
Less than 100 mph
128
43
26
6.72
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100 to 400 mph
156
53
58
0.47
Over 400 mph
291
98
145}
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28.54
Meteor-like
24
8
16
Not stated
491
166
136
5.42
Total
1286
434
434
43.71
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Degrees of freedom
4
5%
9.5
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1%
13. 3
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74
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