Setting up R Project Link to download R: https://www.rstudio.com/products/rstudio/download/ Link to download R console: https://www.r-project.org/ Useful links for R: https://www.rdocumentation.org/ https://cran.r-project.org/manuals.html

csv. file Example of csv. file link: http://professormo.com/statClub.html

Setting up the directory of opening the file

setwd(dir) setwd (Set Working Directory) returns the current directory before the change, invisibly and with the same conventions as getwd. It will give an error if it does not exist. Variables can then be accessed by their name only.

How to find the directory of file

Accessing the csv. file

Attach the file

Access the first row of the values in csv. file

names(file object name) Returns the first row of values

Showing the overall point above 2 colleges

boxplot(varA~varB) Produce box-and-whisker plot(s) of the given (grouped) values. varA : The variable that represent the number ~ : the connection to varA and varB varB : The object that compares

Showing the elements in “Division” column

levels(var) levels provides access to the levels attribute of a variable. The first form returns the value of the levels of its argument and the second sets the attribute.

T-test of overall and college

t.test(varA~varB) Performs one and two sample t-tests on vectors of data. varA: The value that is using for calculation varB: The binary variable that defines the populations being compared

Left-tailed t-test

Showing the table of gender in Division

myTable <-table(varA, varB): table: table uses the cross-classifying factors to build a contingency table of the counts at each combination of factor levels. <- : assignment operator myTable: the variable that contains all the collection of

Showing the histograms of easiness

hist(dataName) hist: The generic function hist computes a histogram of the given data values. dataName: the value that is calculated for the histogram.