PSY 2106 Chapter Notes - Chapter 9: Variance, Squared Deviations From The Mean, Statistic
12 Apr 2020
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Document Summary
Used as an estimate of the real standard error when the value of the sd is unknown. Used to test hypothesis about an unknown population mean when the value of the standard deviation is unknown. The complete set of t values computed for every possible random sample for a specific sample size/specific degrees of freedom. A range of values centred around a sample statistic. Percentage of variance accounted for by the treatment. Computing the sum of squared deviations ( ss ) for each set of scores. Substituting the corresponding sample values in the place of unknown population values. Describes the number of scores in a sample that are independent and free to vary. A t statistic is used instead of a z -score when the population standard deviation and variance are unknown . A researcher reports a t-statistic with df = 20.
