QMS 202 Study Guide - Final Guide: Analysis Of Variance, University Of Florida, F-Test

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10 Feb 2018
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Testing: 2 sample test: means of 2 pop"t. Pooled-variance t-test btwn means: whether there"s a significant difference btwn the. Df = n1 + n2 2 (cid:2202)(cid:2175)(cid:2176)(cid:2176)=((cid:3025)(cid:3117) (cid:3025)(cid:3118)) (cid:4666)(cid:3117) (cid:3118)(cid:4667) Where: pooled variance = (cid:2175)(cid:2198)(cid:2779)=(cid:4666)(cid:3041)(cid:3117) (cid:2869)(cid:4667)(cid:3020)(cid:3117)(cid:3118)+(cid:4666)(cid:3041)(cid:3118) (cid:2869)(cid:4667)(cid:3020)(cid:3118)(cid:3118) (cid:4666)(cid:3041)(cid:3117) (cid:2869)(cid:4667)+(cid:4666)(cid:3041)(cid:3118) (cid:2869)(cid:4667) (cid:1845)(cid:3036)(cid:2870) var. of sample taken from pop"t 1&2. When n1 = n2: pooled var = (cid:2175)(cid:2198)(cid:2779)= (cid:3020)(cid:3117)(cid:3118)+(cid:3020)(cid:3118)(cid:3118)(cid:2870) 2-tail test for given level of sign: reject h0 if tstat > upper-tail c. v, reject h0 if tstat < lower-tail c. v. 1-tail test: rejection in lower tail: reject h0 if tstat < lower tail c. v. 1-tail test: rejection in upper tail: reject h0 if tstat > upper tail c. v. Casio t-test pooled-variance: test, t, 2-s var than pooled = off** F-test for ratio of 2 variances: determine which t test to use. F critical value: 2 tail test: fu (f upper) & fl (f lower):