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  2. Standard penetration test - Wikipedia

    en.wikipedia.org/wiki/Standard_penetration_test

    Symbol used in drawings Standard penetration test N values from a surficial aquifer in south Florida. The standard penetration test (SPT) is an in-situ dynamic penetration test designed to provide information on the geotechnical engineering properties of soil. This test is the most frequently used subsurface exploration drilling test performed ...

  3. Web colors - Wikipedia

    en.wikipedia.org/wiki/Web_colors

    RGB values are usually given in the 0–255 range; if they are in the 0–1 range, the values are multiplied by 255 before conversion. This number divided by sixteen (integer division; ignoring any remainder) gives the first hexadecimal digit (between 0 and F, where the letters A to F represent the numbers 10 to 15.

  4. Standard normal table - Wikipedia

    en.wikipedia.org/wiki/Standard_normal_table

    In statistics, a standard normal table, also called the unit normal table or Z table, [1] is a mathematical table for the values of Φ, the cumulative distribution function of the normal distribution.

  5. International Standard Atmosphere - Wikipedia

    en.wikipedia.org/wiki/International_Standard...

    Thus the standard consists of a tabulation of values at various altitudes, plus some formulas by which those values were derived. To accommodate the lowest points on Earth , the model starts at a base geopotential altitude of 610 meters (2,000 ft) below sea level , with standard temperature set at 19 °C.

  6. p-value - Wikipedia

    en.wikipedia.org/wiki/P-value

    Second, it is also used to abbreviate "expect value", which is the expected number of times that one expects to obtain a test statistic at least as extreme as the one that was actually observed if one assumes that the null hypothesis is true. [49] This expect-value is the product of the number of tests and the p-value.

  7. List of resistors - Wikipedia

    en.wikipedia.org/wiki/List_of_resistors

    A resistance decade box or resistor substitution box is a unit containing resistors of many values, with one or more mechanical switches which allow any one of various discrete resistances offered by the box to be dialed in. Usually the resistance is accurate to high precision, ranging from laboratory/calibration grade accuracy of 20 parts per ...

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