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In the empirical sciences, the so-called three-sigma rule of thumb (or 3 σ rule) expresses a conventional heuristic that nearly all values are taken to lie within three standard deviations of the mean, and thus it is empirically useful to treat 99.7% probability as near certainty.
In software engineering, code coverage, also called test coverage, is a percentage measure of the degree to which the source code of a program is executed when a particular test suite is run. A program with high code coverage has more of its source code executed during testing, which suggests it has a lower chance of containing undetected ...
BASIC—Beginner's All-Purpose Symbolic Instruction Code; BBP—Baseband Processor; BBS—Bulletin Board System; BC—Business Continuity; BCC—Blind Carbon Copy; BCD—Binary Coded Decimal; BCD—Boot Configuration Data; BCNF—Boyce–Codd normal form; BCP—Business Continuity Planning; BCP—Best Current Practice; BE—Backend
The machines developed incorporate an interactive ballot that is printed by each voter to validate results, and then deposited back into voting machines. [ 99 ] [ 101 ] According to The Voting System Assessment Project, interest in the voting system was expressed by other districts in the United States and internationally.
In general, the number of nines is not often used by a network engineer when modeling and measuring availability because it is hard to apply in formula. More often, the unavailability expressed as a probability (like 0.00001), or a downtime per year is quoted. Availability specified as a number of nines is often seen in marketing documents.
For example, out of all intervals computed at the 95% level, 95% of them should contain the parameter's true value. [ 3 ] Factors affecting the width of the CI include the sample size , the variability in the sample, and the confidence level. [ 4 ]
In 1971, he set up a new division within CDC to develop PLATO "courseware", and eventually many of CDC's own initial training and technical manuals ran on it. In 1974, PLATO was running on in-house machines at CDC headquarters in Minneapolis, and in 1976, they purchased the commercial rights in exchange for a new CDC Cyber machine.
By the end of 1980, 1500 user ports were available. By July 1981, the number of IRC computers had grown to 18: this increased the proportion of phone subscribers who could dial-up Prestel at local rates from 30% to 62%. [62]: 129 By 1984, the short dialling codes 618 and 918 could be used in most of the UK for access at local call rates.