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From NY Times:
WASHINGTON — A former Navy reservist killed at least 12 people on Monday
in a mass shooting at a secure military facility that led the
authorities to lock down part of the nation’s capital — even after the
gunman was killed — in a hunt for two other armed men spotted by video
cameras, officials said.
But by Monday evening, the federal authorities said they believed the
shooting was the act of a lone gunman, identified as Aaron Alexis, 34,
who was working for a military subcontractor.
The chaos at the facility, the Washington Navy Yard, started just after
8 a.m. Civilian employees described a scene of confusion as shots
erupted through the hallways of the Naval Sea Systems Command
headquarters, on the banks of the Anacostia River a few miles from the
White House and about a half-mile from the Capitol.
“I heard three gunshots, pow, pow, pow, straight in a row,” said
Patricia Ward, a logistics management specialist from Woodbridge, Va.,
who was in the cafeteria on the first floor when the shooting started.
“About three seconds later, there were four more gunshots, and all of
the people in the cafeteria were panicking, trying to figure out which
way we were going to run out.”
Police officers who swarmed the military facility exchanged fire with
Mr. Alexis, 34, a former naval reservist in Fort Worth. Police officers
shot Mr. Alexis to death, law enforcement officials said, but not before
a dozen people were killed and several others, including a city police
officer, were wounded and taken to local hospitals.
The GCP event was set for 6 hours, beginning at 08:00 local time (12:00
GMT). The result was Chisquare
21528.044 on 21600 df, for p = 0.634 and Z = -0.343.
This analysis was corrected after removing one bad egg.
It is important to keep in mind that we have only a tiny
statistical effect, so that it is always hard to distinguish
signal from noise. This means that every "success" might be
largely driven by chance, and every "null" might include a real
signal overwhelmed by noise. In the long run, a real effect can
be identified only by patiently accumulating replications of
similar analyses.
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