Statistics324_HW6

Statistics324_HW6 - Statistics 324 Discussion 311 w Jack Homework 6 Victoria Yakovleva 1 with(vitcap t.test(vital.capacity~group conf.level=0.99

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Statistics 324 – Discussion 311 w/ Jack Homework 6 – Victoria Yakovleva 1. with(vitcap, t.test(vital.capacity~group, conf.level=0.99)) Welch Two Sample t-test data: vital.capacity by group t = -2.9228, df = 19.019, p-value = 0.008724 alternative hypothesis: true difference in means is not equal to 0 99 percent confidence interval: -2.06447665 -0.02219002 sample estimates: mean in group 1 mean in group 3 3.949167 4.992500 The result of this comparison may be misleading because there are only a total of 24 workers whose vital capacities were collected.
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2. Paired t-test data: pre and post t = 11.9414, df = 10, p-value = 3.059e-07 alternative hypothesis: true difference in means is not equal to 0 95 percent confidence interval: 1074.072 1566.838 sample estimates: mean of the differences 1320.455
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dd<-intake$post-intake$pre str(dd) num [1:11] -1350 -1250 -1755 -1020 -745 . .. avg<-with(intake,(post+pre)/2) str(avg) num [1:11] 4585 4845 4762 5670 6018 . .. xyplot(dd~avg,type=c("g","p"), aspect="iso")
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This note was uploaded on 03/27/2008 for the course STAT 324 taught by Professor Bates during the Fall '06 term at Wisconsin.

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Statistics324_HW6 - Statistics 324 Discussion 311 w Jack Homework 6 Victoria Yakovleva 1 with(vitcap t.test(vital.capacity~group conf.level=0.99

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