Difficulty: Medium

Average Score: 52%

Which variable is quantitative?

Rationale

Body weight in a study about the impacts of exercise.

Body weight is a measurable variable expressed in units such as kilograms or pounds, making it quantitative. In research, quantitative variables allow for statistical analysis and can be used to assess relationships, such as the impact of exercise on weight changes.

A (Species in a study about plant growth) YOUR ANSWER

Species classification is a categorical variable, as it involves grouping plants into distinct categories based on their type or kind. While researchers may collect data on different species, the variable itself does not have a numerical representation, making it qualitative rather than quantitative.

B (Political affiliation in a study about academic areas of interest) YOUR ANSWER

Political affiliation is another categorical variable, which classifies individuals into groups such as Democrat, Republican, or Independent. This variable does not provide numerical data and cannot be measured quantitatively, as it reflects subjective categories rather than objective counts or measurements.

C (Food group in a study about the eating habits of professional athletes) YOUR ANSWER

Food group is also a categorical variable. It classifies foods into categories such as fruits, vegetables, grains, etc. While researchers may analyze the consumption of various food groups, the variable itself does not possess a numeric value, thus rendering it qualitative.

D (Body weight in a study about the impacts of exercise) CORRECT

Body weight is a quantitative variable because it can be measured and expressed numerically. Researchers can analyze the relationship between exercise and body weight changes using statistical methods, allowing for an assessment of how exercise impacts this measurable trait.

Conclusion

Quantitative variables are essential in research as they provide numerical data that can be analyzed statistically. Among the options presented, body weight is the only variable that can be quantified, allowing researchers to explore the effects of exercise in measurable terms. In contrast, species, political affiliation, and food group are categorical variables that lack numerical values and do not support quantitative analysis.

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