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Epstein compared "feelings of fear and anxiety" of experienced parachutists (more than 100 jumps) to those of novices (fewer than 10 jumps)

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Epstein compared "feelings of fear and anxiety" of experienced parachutists (more than 100 jumps) to those of novices (fewer than 10 jumps). Feelings were measured on a questionnaire with scores from 1 (calm) to 10 (very nervous). The subjects were all men in their 20s. Identify:
a.      the dependent variable
b.      the independent variable, and the names of the levels
c.      a controlled extraneous variable
d.      a quantitative variable
e.      a categorical variable