Question 29

Body weight in a study about the impacts of exercise is a quantitative variable.

Quantitative variables are those that can be measured numerically. Body weight, being measurable in units such as kilograms or pounds, qualifies as a quantitative variable in the context of studying exercise impacts.

A) Species in a study about plant growth

Species is a categorical variable, as it classifies plants into distinct groups without a numerical representation. It does not provide information that can be measured or quantified, making it incorrect as a quantitative variable.

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

Political affiliation is also a categorical variable, as it groups individuals based on their political beliefs rather than a measurable quantity. This classification does not lend itself to numerical analysis, thus it is not quantitative.

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

Food group represents a classification based on types of food rather than numerical data. It is categorical in nature, failing to meet the criteria for a quantitative variable.

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

Body weight is a quantitative variable because it can be measured and expressed in numerical terms. This allows for statistical analysis regarding its relationship with exercise, making it the correct choice.

Conclusion

Body weight is definitively a quantitative variable as it can be measured and analyzed numerically, which is essential for drawing conclusions in studies related to exercise impacts. In contrast, all other options are categorical variables that do not provide measurable data, thereby failing to meet the criteria for quantitative classification.