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

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TABLE V
CHI SQUARE TEST OF KNOWNS VERSUS UNKNOWNS
ON THE BASIS OF DURATION OF OBSERVATION
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'
Adjusted
x2
Duration of
Number of
Number of
Number of
{K-n} 2
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Observation
KNOWNS
KNOWNS (K)
UNKNOWNS (n)
K
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5 sec or less
259
64
27
21.39
6-10 sec
92
23
21
o. 17
11-30 sec
153
38
33
0.66
31-60 sec
108
26
42
9.85
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61 sec-5 min
269
66
99
16.50
6-30 min
305
75
71
0.21
Over 30 min
135
33
37
0.48
Not stated
444
109
104
0.23
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Total
1765
434
434
49.49
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Degrees of freedom
7
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5%
14. 1
1%
18. 5
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65
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