Question

for each part below, indicate whether the variable is a quantitative or a categorical (qualitative) variable.
variable\ttype of variable
(a) mothers occupation\tquantitative
\tcategorical
(b) height (in centimeters) of an olympic athlete\tquantitative
\tcategorical
(c) blood type (a, b, ab, or o)\tquantitative
\tcategorical
(d) closing price (in dollars) of a stock\tquantitative
\tcategorical

Explanation:

Quantitative variables represent amounts and can be measured numerically. Categorical variables represent types and are divided into groups.
(a) Mother's occupation is a type of job, so it's categorical.
(b) Height in centimeters is a numerical measurement, so it's quantitative.
(c) Blood type is a classification into groups, so it's categorical.
(d) Closing - price of a stock in dollars is a numerical value, so it's quantitative.

Answer:

(a) Categorical
(b) Quantitative
(c) Categorical
(d) Quantitative