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15 Cards in this Set
- Front
- Back
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Percent Error/Percent Difference |
PE/PD= |(expected - actual)/expected|×100 |
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Count Rate |
CR = counts/time |
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Net Counts |
NC = Gross Counts - Background Counts |
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Net Count Rate |
NCR = (gross counts - background counts)/time |
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Mean |
mean = ∑n / N N = total number of values n = individual values ∑ = Summation |
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Median |
Middle value of the series once arranged in numerical order or Median = (mid value₁ + mid value₂) / 2 |
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Mode |
Most frequently occurring number If two or three then series is bimodal or trimodal |
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Standard Deviation of Population or Series of Values |
SD = √(∑(n - mean of values)² / N - 1) |
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Standard Deviation From a Single Value |
SD = √x |
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Standard Deviation From a Single Value at a Desired Confidence Interval |
CI% = n ± x√n % = 68%, 95%, 99% and x is respectively = 1, 2, 3 |
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Percent Error/Coefficient of Variation for a Series of Values |
CV = (xSD / mean) × 100% x = Number of Standard Deviations |
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Error Inherent in a Single Value |
%SD = (x100% / √N) x = Number of Standard Deviations N = Single Value Solving for %SD |
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Determination of Counts Required for Statistical Significance |
%Error = (x100% / √N) x = Number of Standard Deviations N = Minimum Counts Solving for N |
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Standard Deviation of a Count Rate |
xSD = √(c / t) x = Number of Standard Deviations |
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Standard Deviation of a Sum or Difference (aka Propagation of Errors) |
SD = √N₁ + N₂ |
