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Topic: Standard score


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 Standard deviation - Wikipedia, the free encyclopedia
The standard deviation is defined as the square root of the variance.
A distinction is made between the standard deviation σ (sigma) of a whole population or of a random variable, and the standard deviation s of a subset-population sample.
When deciding whether measurements agree with a theoretical prediction, the standard deviation of those measurements is of crucial importance: if the mean of the measurements is too far away from the prediction (with the distance measured in standard deviations), then we consider the measurements as contradicting the prediction.
en.wikipedia.org /wiki/Standard_deviation   (1436 words)

  
 Standard score - Wikipedia, the free encyclopedia
In statistics, a standard score (also called z-score or normal score) is a dimensionless quantity derived by subtracting the population mean from an individual (raw) score and then dividing the difference by the population standard deviation.
The standard score is not the same as the Z-Factor used in the analysis of high-throughput screening data, but is sometimes confused with it.
σ is the standard deviation of the population
www.sciencedaily.com /encyclopedia/standard_score   (332 words)

  
 ipedia.com: Standard deviation Article   (Site not responding. Last check: 2007-10-08)
We distinguish between the standard deviation σ (sigma) of a whole population or of a random variable, and the standard deviation s of a sample.
Simply put, the standard deviation tells us how far a typical member of a sample or population is from the mean value of that sample or population.
Standard deviation is often thought of as a measure of uncertainty.
www.ipedia.com /standard_deviation_1.html   (811 words)

  
 Standard score: Facts and details from Encyclopedia Topic   (Site not responding. Last check: 2007-10-08)
(the exam scores of two students in different classes may be compared by converting each student's exam score based on the mean and standard deviation of the scores in his or her own class.
Standard scores are chiefly appropriate for data that are normally Normal distribution quick summary:
The percentile rank of a score is the percentage of scores in its frequency distribution which are lower....
www.absoluteastronomy.com /encyclopedia/s/st/standard_score.htm   (1034 words)

  
 Standard score - All About All   (Site not responding. Last check: 2007-10-08)
In statistics, a standard score (z) is a dimensionless quantity derived by subtracting the population mean from an individual (raw) score and then dividing the difference by the population standard deviation:
The key point to remember for the z score is that it is calculated using the population mean and the population standard deviation and not the sample mean or sample deviation.
Calculation of the z score requires knowledge of the population statistics as opposed to the statistics of a sample drawn from the population of interest.
www.answers-zone.com /article/Standard_score   (436 words)

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