Question

Ns the population ages, there is increasing concem about acddent-related injunies to the edely, n aride reported on an experiment in which the maximum lean angle-the turthest a subject is able to lean and still recover in one step-as determined tor both a sample ot younger females (21-29 (67-91 year). ears) and a The tollowing cbservations are cons stent with summary data given in the article: Use tha follewing R code to visualize the data, pafarm a t teat and calculate the 9556 CI. sarmple of lder fes( Data and R Code YF- 29, 36, 32, 27, 20, 32, 31, 36, 32, 25, 20, 39, 29, 24, 33, 27, 28, 32, 31, 24 OF - c 25, 20, 22, 23, 22, 18, 10, 26, 18, 14, 22, 17) boxplot YF, OF) L.LesLCYF, 06, alternative-greater" ttest YF, oFsconf.int Which of the felluwing is true based on the side by side boxplot of the data? Tha younger fenales tend to havc higher maximum lean angles than oldar femalcs The older temales tend to have higher maximum lean angles than younger temales. The maximurm lean anple is approximately the same for younger and clder females

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Answer 1

> YF=c(29,36,32,27,20,32,31,36,32,25,20,39,29,34,33,27,28,32,31,34)
> OF=c(25,20,22,23,22,18,10,26,18,14,22,17)
> boxplot(YF, OF)

The younger females tend to have higher maximum lean angles than older females.

T=t.test(YF, OF, alternative = "greater", conf.level = 0.95)
T
T$conf.int