A Bloomberg Businessweek North American subscriber study collected data from a sample of 2681 subscribers. Fifty-nine percent of the respondents indicated an annual income of $75,000 or more, and 50% reported having an American Express credit card.
B.Is annual income a categorical or quantitative variable ?
C.Is ownership of an American Express card a categorical or quantitative variable?
D. Does this study involve cross-sectional or timevseries data?