R notes for Activity 22-3

Since we ended up with very different sample sizes (I'm not sure why), I've put the data into two files, Convenient.csv and Inconvenient.csv.

Convenient = read.csv("/home/rebelsky/Stats115/Data/ConvenientSequence.csv")
Inconvenient = read.csv("/home/rebelsky/Stats115/Data/InconvenientSequence.csv")

22-3 e. Visual displays

Here are the commands you might use to build four windows with the four separate displays.

library(BHH2, lib="/home/rebelsky/Stats115/Packages")
X11()
boxplot(Convenient,horizontal=T)
X11()
boxplot(Inconvenient,horizontal=T)
X11()
dotPlot(Convenient)
X11()
dotPlot(Inconvenient)

22-3 g. Test Statistics

Are we doing a two-sided test or a one-sided test? If you're using a one-sided test, which is the direction of the test? Use your answer to figure out which of the following commands to select.

t.test(Convenient,Inconvenient)
t.test(Convenient,Inconvenient, alternative="greater")
t.test(Convenient,Inconvenient, alternative="less")

22-3 h. Confidence intervals

Add conf.level=.90 to your previous answer to compute the confidence interval.

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