I. Suppose that data is imported into R with the command: data=read.csv("data.csv"). Which procedure will tell use the usable variables in the dataset?
1-variables(data)
2-names(data)
3-labels(data)
4-None of the above
II-Suppose that one of the variables in the data set was "age".Which command would return a vector of all the ages in the data set?
1-data[age]
2-data%age
3-data&age
4-None of the above