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In statistics, the 68–95–99.7 rule, also known as the empirical rule, and sometimes abbreviated 3sr, is a shorthand used to remember the percentage of values that lie within an interval estimate in a normal distribution: approximately 68%, 95%, and 99.7% of the values lie within one, two, and three standard deviations of the mean, respectively.
Hazard ratio. In survival analysis, the hazard ratio ( HR) is the ratio of the hazard rates corresponding to the conditions characterised by two distinct levels of a treatment variable of interest. For example, in a clinical study of a drug, the treated population may die at twice the rate per unit time [clarify] of the control population.
95% of the area under the normal distribution lies within 1.96 standard deviations away from the mean. In probability and statistics, the 97.5th percentile point of the standard normal distribution is a number commonly used for statistical calculations. The approximate value of this number is 1.96, meaning that 95% of the area under a normal ...
By the current "deviation IQ" definition of IQ test standard scores, about two-thirds of all test-takers obtain scores from 85 to 115, and about 5 percent of the population scores above 125 (i.e. normal distribution).
Capsize screening formula. The capsize screening formula (CSF) is a controversial method of establishing the ability of boats to resist capsizing. It is defined for sailboats as: Beam / ( ( Displacement /64.2) 1/3 ), with Displacement measured in pounds, and Beam in feet. A lower figure supposedly indicates greater stability, however the ...
Chicago high school rankings are determined by the average test scores on state achievement tests. [306] The district, with an enrollment exceeding 400,545 students (2013–2014 20th Day Enrollment), is the third-largest in the U.S. [ 307 ] On September 10, 2012, teachers for the Chicago Teachers Union went on strike for the first time since ...
Microsoft Corporation is an American multinational corporation and technology company headquartered in Redmond, Washington. [ 2] Its best-known software products are the Windows line of operating systems, the Microsoft 365 suite of productivity applications, the Azure cloud computing platform and the Edge web browser.
Borax (also referred to as sodium borate, tincal ( / ˈtɪŋkəl /) and tincar ( / ˈtɪŋkər / )) is a salt ( ionic compound), a hydrated or anhydrous borate of sodium, with the chemical formula Na 2 H 20 B 4 O 17 (also written as Na 2 B 4 O 7·10H2O[ 1][ a] ). It is a colorless crystalline solid that dissolves in water to make a basic solution .