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chap 4 terms

# chap 4 terms - standard distance from the mean sample...

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Chapter 4 New Terms and Concepts The following terms were introduced in this chapter. You should be able to define and explain each term and, where appropriate, describe how each term is related to other terms on the list. variability: A measure of the degree to which the scores in a distribution are clustered together or spread apart. range: The distance from the upper real limit of the highest score to the lower real limit of the lowest score; the total distance from the absolute highest point to the lowest point in the distribution. deviation score: The distance (and direction) from the mean to a specific score. Deviation = X –μ. population variance: The average squared distance from the mean; the mean of the squared deviations. population standard deviation: The square root of the population variance; a measure of the
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Unformatted text preview: standard distance from the mean. sample variance: The sum of the squared deviations divided by df = n-1. An unbiased estimate of the population variance. sample standard deviation: The square root of the sample variance. degrees of freedom: The number of scores in a sample that are independent and free to vary with no restriction. df = n -1. biased statistic: A statistic that, on average, consistently tends to overestimate (or underestimate) the corresponding population parameter. unbiased statistic: A statistic that, on average, provides an accurate estimate of the corresponding population parameter. The sample mean and sample variance are unbiased statistics....
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