MKT 317 Lecture Notes - Confidence Interval, Statistical Hypothesis Testing
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Example: test the claim that the new training method reduces assembly time by more than 2 minutes per unit. N2 = 9: h0: 1 - 2 2 (right-tailed test) H1: 1 - 2 > 2: n1 & n2 < 30 t-test, 2 means, right-tailed, = 0. 05, df = 9 + 9 2 = 16 tcrit = 1. 746, sp. 5. tcalc = 0. 747, tcrit = 1. 46 tcalc < tcrit do not reject h0: the new training method does not decrease assembly time by more than 2 mins per unit. Z-test on two means: are grad students at msu older than grad students at cmu. Cmu x 2 = 24. 9 years s2 = 3. 5 years n2 = 250. Msu x 1 = 28. 7 years s1 = 5. 1 years n1 = 125: h0: 1 2. H1: 1 > 2: both n1 & n2 30 z-test & right-tailed test, = 0. 05 zcrit. Can only be used if both sample sizes are >30.
