Given the purpose statement or research question in a–c, determine the variable being measured, the type of variable, and corresponding measurement scale.

a. Purpose statement: To examine the percentage difference between GA pilots who re- ceived their PPL from a Part 141 vs. a Part 61 flight program.

b. RQ: To what extent does an airline's ranking-based on scheduled passenger revenue (millions USD)-relate to the number of passenger bookings?

c. RQ: To what extent does pilot age-measured by categories of years such as younger than 19, 20-29, 30-39, etc.-relate to their total number of flight hours?