Introduction to Statistics (MAT/SST 115.03 2008S)
You can read the data and preview basic information with
Backpack = read.csv("/home/rebelsky/Stats115/Data/Backpack.csv") summary(Backpack) head(Backpack) tail(Backpack)
As you will find, there are 100 rows in the table, and three
columns. The columns are labeled
This question asks you to build a vector that represents the ratio of backpack weight to body weight. As you may recall, we can create that vector with
Ratio = Backpack$BackpackWeight/Backpack$BodyWeight
You should be able to figure out the appropriate ways to display these data. If you'd like to get a histogram close to the one in the sample answers, you can use
hist(Ratio, breaks=seq(from=-0.008, to=0.20, by=0.015), axes=FALSE, main="", xlab="Ratio of Backpack Weight to Body Weight" ) axis(1, seq(from=0,to=0.2,by=0.02)) axis(2, seq(from=0,to=20,by=4))
The authors recommend that you compute this confidence interval by
hand. However, you may also use
Copyright (c) 2007-8 Samuel A. Rebelsky.
This work is licensed under a Creative Commons
Attribution-NonCommercial 2.5 License. To view a copy of this
or send a letter to Creative Commons, 543 Howard Street, 5th Floor,
San Francisco, California, 94105, USA.