Aresearcher is investigating alertness. she asked 20 subjects who habitually had either 6, 7, 8, or 9 hours of sleep every night to complete the stanford sleepiness scale (sss). the sss is a measure of alertness and simply requires the subject to rate his or her level of alertness by responding with a number between 1 (very alert) and 7 (struggling to stay awake). each subject did this in the morning, the afternoon, the evening, and at night. the subject was also asked to self-identify as either a night-person or a morning-person. it is safe to assume that none of the subjects have unusual hours, such as getting up at 10 at night.
in the space below, list the variables; state how many categories each variable has (if more than six, simply write "several"); list the categories (if there are more than six categories, simply list six possible categories - you may have to guess what the categories may be - don't worry if you have the correct units - that isn't part of the question); and state the scale of measurement for each variable (i. e., nominal, ordinal, interval, ratio). put each variable on a separate row.

variable # of categories
categories scale