A researcher wants to investigate whether different forms of exercise can be used to help hyperactive children.A group of 90 children is divided into two groups according to age - those aged 9-12 and those aged 5-9.Within each age group the children are randomly assigned to one of three groups.The first group will just do their normal exercise.The second group will be given an additional exercise routine (moderate) .The third group will be given an additional exercise routine (strenuous) .At the end of a four-month period,parents will be asked to evaluate their children's progress.Identify the factor(s) and any blocking variables and the number of levels for each.

A) Factor: exercise (3 levels) ,Blocking variable: age (2 levels)
B) Blocking variable: exercise (3 levels) ,Factor: age (2 levels)
C) Factor: exercise (3 levels) ,Factor: age (2 levels)
D) Normal exercise and age 5-9,additional exercise (moderate) and age 5-9,additional exercise (strenuous) and age 5-9,normal exercise and age 9-12,additional exercise (moderate) and age 9-12,additional exercise (strenuous) and age 9-12 (6 levels)
E) Factor: Normal exercise,additional exercise (moderate) ,additional exercise (strenuous) (3 levels)

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Jeffery Louis · Accepted Answer

Final Answer : A, Explanation :  The factor is exercise with three levels (normal, additional moderate, additional strenuous) and the blocking variable is age with two levels (5-9 and 9-12). This design allows for investigating the effect of exercise on hyperactivity in both age groups and controls for potential age-related differences.

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