a researcher is interested in the relationship between leisure time physical act

a researcher is interested in the relationship between leisure time physical activity, diet, extracurricular activities and hours of sleep with cardiovascular fitness in children ages 6 thought 12. She will recruit 100 children to participate in the study. Cardiovascular fitness will be assessed via a 6-minute walk test. leisure time physical activity, diet, extracurricular activities and hours of sleep will be assessed through questionnaires completed by their parents.
trying to identify the IV, DV and the Difference/Relationship

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