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

Question

Quizplus · Accepted Answer

This design is a randomized block design because the participants are divided into blocks based on their age. Within each age group, the participants are randomly assigned to one of the three exercise groups. This design allows for comparison between the different exercise groups while controlling for the potential confounding variable of age.

A Researcher Wants to Investigate Whether Different Forms of Exercise