Question

type of study
identify the type of study
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studying how people solve math problems while standing on one foot versus two feet
experimental
studying toddlers at the ikea ball pit
descriptive
studying how the bmi of playboy centerfolds has changed over time
correlational

Explanation:

1. For the first study, researchers manipulate the independent variable (standing on one foot vs two feet) to measure its effect on math problem-solving, which defines an experimental study.
2. The second study only observes and describes the behavior of toddlers in the ball pit without manipulating variables, making it descriptive.
3. The third study examines the relationship between time (a variable) and BMI of centerfolds, looking for an association without manipulation, so it is correlational.

Answer:

• Studying how people solve math problems while standing on one foot versus two feet = Experimental
• Studying toddlers at the Ikea ball pit = Descriptive
• Studying how the BMI of Playboy centerfolds has changed over time = Correlational