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Earn +20 ptsQ: How do you use standard deviation?
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Why use standard deviation and not average deviation?
Because the average deviation will always be zero.
Why use the T score?
T-score is used when you don't have the population standard deviation and must use the sample standard deviation as a substitute.
What does the sample standard deviation best estimate?
The standard deviation of the population. the standard deviation of the population.
Why does the effect-size calculation use standard deviation rather than standard error?
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.
What is standard deviation of 155.45?
The standard deviation is 0.
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