A Researcher Wants to Investigate Whether Different Forms of Exercise

Multiple Choice

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.

A) Completely randomized over one factor (exercise)
B) Randomized block design,blocking on age,with one factor,exercise.
C) Randomized block design,blocking on exercise,with one factor,age
D) Completely randomized over two factors,exercise and age
E) None of the above