For each variable, determine whether it is best thought of as discrete or continuous.

Variable Discrete Continuous

(a) The number of your fellow classmates who have used the World Wide Web for information on Seasonal Affective Disorder

(b) The cranial capacity (space inside the skull) of a human skull

(c) In a reaction time study involving 12

participants, the number of participants whose average time is between 400 and 600 milliseconds

(d) The lifetime, in hours, of a 100-watt light bulb manufactured by Northington Industries