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t test
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hypothesis-testing procedure in which the population variance is unknown compares t scores...
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t test for a single sample
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hypothesis testing procedure in which a sample mean is being compared to a known population...
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biased estimate
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estimate of a population parameter that is likely systematically to overestimate or underestimate...
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unbiased estimate of the population variance
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estimate of the population variance, based on sample scores, which has been fixed- that it's...
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degrees of freedom
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number of scores free to vary when estimating a population parameter; usually part of a formula...
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t distribution
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mathematicall defined curve that is the comparison distribution used in a t test
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t table
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table of cutoff scores on the t distribution for various degrees of freedom, significane levels,...
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t score
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on a t distribution, number of standard deviations from the mean
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repeated-measures design
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research strategy in which each person is tested more than once; same as within subjects design
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t test for dependent means
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hypothesis-testing procedure in which there are two scores for each person and the poulation...
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difference scores
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difference between a person's score on one testing and the same person's score on another testing
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assumption
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condition, such as a population's having a normal distribution, required for carrying out a...
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robustness
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extent to which a particular hypothesis-testing procedure is reasonably accurate even when...
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