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The form of the "Z" symbol is a reproduction of the Latin letter Z, identical also to a capital Greek zeta. The "Z" symbol is used instead of the equivalent Cyrillic letter З (Ze) used in the Russian alphabet, which has been described as peculiar, considering the symbol's later association with Russian nationalism and pro-Putin politics. [27]
Russia’s defense ministry has not explicitly commented on the use of the letter in its current context, but did post on Instagram last week that the pro-war symbol stems from the Russian phrase ...
The Fisher Space Pen was not commissioned by NASA at a cost of millions of dollars, while the Soviets used pencils. It was independently developed by Paul C. Fisher, founder of the Fisher Pen Company, with $1 million of his own funds. [19] NASA tested and approved the pen for space use, then purchased 400 pens at $6 per pen. [20]
Comparison of the various grading methods in a normal distribution, including: standard deviations, cumulative percentages, percentile equivalents, z-scores, T-scores. In statistics, the standard score is the number of standard deviations by which the value of a raw score (i.e., an observed value or data point) is above or below the mean value of what is being observed or measured.
Stanine (STAndard NINE) is a method of scaling test scores on a nine-point standard scale with a mean of five and a standard deviation of two. Some web sources attribute stanines to the U.S. Army Air Forces during World War II.
Cartesian z-axis basis unit vector unitless angular momentum: newton meter second (N⋅m⋅s or kg⋅m 2 ⋅s −1) inductance: henry (H) luminosity: watt (W) Lagrangian: joule (J) Lagrangian density: joule per cubic meter (J/m 3) length: meter (m) ℓ
where z is the standard score or "z-score", i.e. z is how many standard deviations above the mean the raw score is (z is negative if the raw score is below the mean). The reason for the choice of the number 21.06 is to bring about the following result: If the scores are normally distributed (i.e. they follow the "bell-shaped curve") then
A test score is a piece of information, usually a number, that conveys the performance of an examinee on a test. One formal definition is that it is "a summary of the evidence contained in an examinee's responses to the items of a test that are related to the construct or constructs being measured."