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Measurements of the variable of interest will differ between subjects. As a result the outcome of an experiment may be different from what was expected. The psychologist will want to know whether that difference is purely the result of random variation between subjects or if it is due to some other factor. The standard deviation is a measure for determining how large a difference might be purely random.

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Q: Why use standard deviation in psychology?

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Information is not sufficient to find mean deviation and standard deviation.

Standard deviation is a statistical concept and not applicable to concrete.

we calculate standard deviation to find the avg of the difference of all values from mean.,

Standard deviation can be greater than the mean.

Standard deviation is the square root of the variance.

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Standard deviation is a statistical measure. It may be used in psychology but is not restricted to that subject. It is a measure of the spread of the distribution of values of some attribute that is being measured.

Because the average deviation will always be zero.

Use %RSD when comparing the deviation for popolations with different means. Use SD to compare data with the same mean.

T-score is used when you don't have the population standard deviation and must use the sample standard deviation as a substitute.

The standard deviation is the standard deviation! Its calculation requires no assumption.

Standard deviation is a measure of how spread out a set of numbers are from each other. It has a variety of uses in statistics.

The standard deviation of the population. the standard deviation of the population.

Yes, to a certain extent. To record data in psychology, such as taking a survey, you record the mean, median, mode, and standard deviation of that group.

The standard deviation is 0.

Information is not sufficient to find mean deviation and standard deviation.

Here's how you do it in Excel: use the function =STDEV(<range with data>). That function calculates standard deviation for a sample.

The goal is to disregard the influence of sample size. When calculating Cohen's d, we use the standard deviation in teh denominator, not the standard error.

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