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BAD 2323 Ch10 Hwk Ex 1 Sample 1 n1 50 m1 13.6 s1 2.2 Sample 2 n2 35 m2 11.6 s2 3 a. Point estimate of the difference between the 2 population means b. Standard error of difference between means. c. 90% confidence interval d. 95% confidence interval e. Computed Zc = f. Reject or Do not Reject Ho? Ex 2 n1 m1 s1 Sample 1 10 22.5 2.5 n1 m1 s1 Sample 2 8 20.1 2 a. Point estimate of the difference between the 2 population means b. Standard error of difference between means. c. 90% confidence interval d. 95% confidence interval e. Computed T c = f. Reject or Do not Reject Ho? Ex 3 Sample 1 Sample 2 10 8 12 8 7 6 7 7 7 4 9 52 Sum 9 42 a. Point estimate of the difference between the 2 population means b. Standard error of difference between means. c. 90% confidence interval d. 95% confidence interval e. Computed T c = f. Reject or Do not Reject Ho? Ex 4 Branch 1 Branch 2 n 32 36 mean 500 375 s 150 130 a. Point estimate of the difference between the 2 population means b. Standard error of difference between means. c. 90% confidence interval Ex 5 Ne1 n mean s 95% confidence interval Table T t = Pooled Variance= Standard Error= Computed T c = Reject or Do not Reject? 8 15700 700 Ne2 12 14500 850 Confidence Interval= Ex 6 observation 1 2 3 4 5 #1 32 30 30 26 32 #2 44 43 44 46 48 #3 33 36 35 36 40 mean variance 30 6 45 4 36 6.5 a. Calculate the between-treatments estimate of s 2 . b. Calculate the within-treatments estimate of s2 . . c. At a = .05 level of significance, Reject or do not Reject Ho that the populations have equal means. Ex 7 observation 1 2 3 4 mean variance #1 165 149 156 142 #2 174 164 180 158 #3 169 154 161 148 153 96.67 169 97.33 158 82 a. Calculate the between-treatments estimate of s 2 . b. Calculate the within-treatments estimate of s2 . . c. At a = .05 level of significance, Reject or do not Reject Ho that the populations have equal means