1. Which variable is numerical?
A. Food group in a study about the eating habits of professional athletes
B. Diet in a study about food and cognitive functioning
C. Screen color in a study about visual perception
D. Skin temperature in a study about reactions to a new medical treatment Correct
Explanation
Numerical variables are measurable on a numeric scale, while the others are categorical. Skin temperature is measured in degrees, making it numerical. Food group, diet type, and screen color are categories without inherent numeric value.
2. Which variable is quantitative?
A. Species in a study about plant growth
B. Political affiliation in a study about academic areas of interest
C. Food group in a study about the eating habits of professional athletes
D. Body weight in a study about the impacts of exercise Correct
Explanation
Quantitative variables have numeric values with meaningful magnitudes, while the others are qualitative categories. Body weight is measured numerically (e.g., in pounds or kilograms). Species, political affiliation, and food group are labels or categories without numeric meaning.
3. Which variable is qualitative?
A. Object volume in a study about object size estimation and perception
B. Time to complete a test in a study about stress and academic performance
C. Interest rate in a study about investment decisions
D. Diet in a study about food and cognitive functioning Correct
Explanation
Qualitative variables describe categories or qualities without numeric measurement, while the others are quantitative. Diet type (e.g., vegan, omnivore) is categorical. Volume, time, and interest rate are measured numerically.
4. A student is conducting research on the study habits of fellow students at a college. Which variable of the study is quantitative?
A. Type of residence
B. Course load (credit hours) Correct
C. Major area of study
D. Primary time of day to study
Explanation
Quantitative variables are numeric and measurable. Course load in credit hours is a number (e.g., 12, 15). Type of residence, major, and time of day are categorical descriptions.
5. A student is conducting research on the study habits of fellow students at a college. Which variable of the study is qualitative?
A. Time spent studying
B. Type of residence Correct
C. Course load (credit hours)
D. Grade point average (GPA)
Explanation
Qualitative variables are categorical and non-numeric. Type of residence (e.g., dorm, off-campus) is a category. Time spent studying, course load, and GPA are all numeric measurements.