PSYCH 2220 Lecture Notes - Lecture 9: Null Hypothesis, Standard Error, Test Statistic
27 Feb 2018
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Elephant pregnancy mu = 525, st dev = 32. Percent in tail = 0. 96% (600 - 525) / 32 = 2. 34 = z score. 510 - 525 / 32 = -0. 47 = z score. % in tail x 2, 100 - that = 31. 92 x 2 = 63. 84 100-63. 84 = 36. 16% We think that clients w/ new therapy will score higher on the self-esteem tests. Mu1 = established clients at local counseling group. Mu2 = clients engaging in new psychotherapy treatment. H0 = clients in the new psychotherapy treatment group score the same as or lower than clients not in the treatment group. H1 = clients in the new psychotherapy treatment group score higher on tests of self esteem than clients not in the treatment group. One-tailed, alpha = 0. 05, look up 5% in tail. Standard error = st dev / square root of n. 4 / square root of 16 = 1.
