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Type I and type II errors. In statistical hypothesis testing, a type I error, or a false positive, is the rejection of the null hypothesis when it is actually true. For example, an innocent person may be convicted. A type II error, or a false negative, is the failure to reject a null hypothesis that is actually false.
The first accident involving a 737 was on July 19, 1970, when a 737-200 was damaged beyond repair during an aborted takeoff, with no fatalities; the first fatal accident occurred on December 8, 1972, when United Airlines Flight 553 crashed while attempting to land, with 45 (43 on board plus 2 on the ground) fatalities; and, as of February 2024 ...
5:20:27: The east penthouse on top of 7 World Trade Center crumbles apart. 5:20:33: 7 World Trade Center, a 47-story building, collapses. The building contained New York's emergency operations center, operated by the NYC Office of Emergency Management, originally intended to respond to disasters such as the September 11 terrorist attacks. Due ...
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Memory errors may include remembering events that never occurred, or remembering them differently from the way they actually happened. [1] These errors or gaps can occur due to a number of different reasons, including the emotional involvement in the situation, expectations and environmental changes. As the retention interval between encoding ...
The year 2038 problem (also known as Y2038, [1] Y2K38, Y2K38 superbug or the Epochalypse [2] [3]) is a time computing problem that leaves some computer systems unable to represent times after 03:14:07 UTC on 19 January 2038. The problem exists in systems which measure Unix time —the number of seconds elapsed since the Unix epoch (00:00:00 UTC ...
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The evacuation zone was extended to a 20-mile radius on Friday, March 30. Within days, 140,000 people had left the area. More than half of the 663,500 population within the 20-mile radius remained in that area. According to a survey conducted in April 1979, 98% of the evacuees had returned to their homes within three weeks.