data51                  Data set number 1 for descriptive statistics
data52                  Data set number 2 for descriptive statistics
data53                  Data set number 3 for descriptive statistics
data54                  Data set number 4 for descriptive statistics
data81                  Data set for statistical hypothesis testing
data82                  Data set for the paired t-test
data91                  Data set for simple linear regression model
data92                  Data set for multiple linear regression model
