If I have a yard full of cats and decided to make a histogram based on the color and markings of the cats, what kind of data would be on the X axis of the histogram?

A) Interval B) ratio C) nominal D) ordinal

If I were counting the number of dump trucks owned by my competition, what type of variable would the count be?

A) continuous B) odiferous C) discontinuous D) discrete

If you conducted a survey of every 5th person leaving the theater where the movie Battleship was playing, what type of sampling have you employed?

A) random B) stratified C) cluster D) systematic