# Standard Score Help : Videos | Worksheets | Word Problems

Many students find standard score difficult. At TuLyn, we have hundreds of free standard score video tutorials, printable standard score worksheets, and standard score word problems to help you better understand standard score and get better grades.

### Probability and Statistics

in Probability and Statistics.

# Standard Score

In statistics, a standard 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. This conversion process is called standardizing or normalizing; however, "normalizing" can refer to many types of ratios.

Standard scores are also called z-values, z-scores, normal scores, and standardized variables; the use of "Z" is because the normal distribution is also known as the "Z distribution". They are most frequently used to compare a sample to a standard normal deviate (standard normal distribution, with μ=0 and σ=1), though they can be defined without assumptions of normality.

The standard score indicates how many standard deviations an observation is above or below the mean: the standard deviation is the unit of measurement of the z-score. It allows comparison of observations from different normal distributions, which is done frequently in research.

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At TuLyn, we have over 2000 math video tutorial clips including standard score videos, standard score practice word problems, standard score questions and answers, and standard score worksheets.

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• Hundreds of video tutorials on standard score make it easy for you to better understand the concept.
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# Top Standard Score Word Problems

• What is the critical z-value (#1230)
What is the critical z-value that corres... ...corresponds to a confidence level of 86%
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• Standard Score (#6752)
On an auto mechanic aptitued test, the m... ...d score of 1.9, how many points is that?
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• Standard Score (#6623)
a standard achievement test has a mean o... ...roximately how many will score below 45?
standard score, statistics