The marketing firm in problem 1 has decided that age may also have an affect on

Question

The marketing firm in problem 1 has decided that age may also have an affect on attention span. They decide to assign the children to groups of fifteen 9 to 10 year olds, fifteen 7 to 8 year olds, and fifteen 5 to 6 year olds. Within each group, the children are asked to watch one 60-second commercial for one of the three types of toys and their attention spans are measured in seconds.

a. Is this an experiment or an observational study?

b. If it is an experiment, is it randomized or block design?

c. If it is an experiment, identify the explanatory and response variables. d. If this is an experiment, draw a diagram representing the levels and treatments.

Explanation / Answer

a) It is an experiment because it is a scientific procedure undertaken to test a hypothesis that whether age effect on the attention span of children or not.

b) It is a blocks design because within the age group the attention span is same.

c) The explanatory and response variables are their attention spans and the children to groups respectively.

d) For this question, the diagram can not draw without data.

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