Data variables can be different types.  In this course, we deal with three different types of variables: nominal, ordinal, and interval.  In class, I will discuss in detail how to determine the type of variable using the following table:

Sex    Rank    Grade(%)
F        1        100
M        2         98
F        3         97
M        4         93
F        5         90
M        6         80
F        7         79
M        8         75
F        9         71
M        10        69
F        11        68
M        12        67
F        13        66
M        14        65
F        15        42