Difficulty: Medium

Average Score: 70%

Which variable is numerical?

Rationale

Skin temperature in a study about reactions to a new medical treatment is numerical.

Skin temperature can be measured and expressed in numerical terms, such as degrees Celsius or Fahrenheit, making it a quantitative variable. This allows for statistical analysis and comparisons, which are essential in evaluating the effects of medical treatments.

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

Food group is a categorical variable, representing different classifications of foods such as grains, proteins, and vegetables. While it provides valuable information about dietary habits, it does not have a numerical representation, making it unsuitable for statistical calculations that require numerical data.

B (Diet in a study about food and cognitive functioning) YOUR ANSWER

Diet also serves as a categorical variable, encompassing various eating patterns or meal plans. Similar to food groups, it lacks a numerical aspect, focusing instead on qualitative classifications that describe types of diets rather than measurable quantities, thus limiting its use in numerical analyses.

C (Screen color in a study about visual perception) YOUR ANSWER

Screen color is a categorical variable that refers to different colors displayed on a screen, such as red, blue, or green. While it plays a crucial role in studies of visual perception, colors cannot be quantified numerically, making them less useful in statistical studies that require numerical values.

D (Skin temperature in a study about reactions to a new medical treatment) CORRECT

Skin temperature is a quantitative variable that can be accurately measured and reported as a number. This allows researchers to assess changes in temperature as a response to medical treatments, facilitating statistical comparisons and conclusions based on the data collected.

Conclusion

In summary, skin temperature stands out as the only numerical variable in the given options, enabling precise measurement and analysis in medical studies. Other choices, while relevant to their respective fields, are categorical and do not lend themselves to numerical evaluation, which is essential for drawing valid scientific conclusions.

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