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

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TABLE IX
CHI SQUARE TEST OF REVISED KNOWNS VERSUS
UNKNOWNS ON THE BASIS OF NUMBER
Number of
Adjusted
x2
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'
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Objects Per
Number of
Number of
Number of
(K-n) 2
Sighting
KNOWNS
KNOWNS (K)
UNKNOWNS (n)
K
1
913
308
297
0.39
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2
142
48
37
2.52
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3-10
168
57
70
2.96
llormore
34
11
25
15.36
Not stated
29
10
5
2.50
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Total
1286
434
434
23.73
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Degrees of freedom
4
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5%
9.5
1%
13.3
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71
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