1. An experiment was carried out to investigate the effect of different treatmen

Question

1. An experiment was carried out to investigate the effect of different treatments on pain relief for migraine sufferers. 120 migraine sufferers were randomly allocated to three groups where one group took medication, one group changed their diet and one group received a placebo. After a month, each subject classified their pain relief into two categories ñno pain relief and some pain relief.

(a) Why is this study classified as an experiment? (b) What are the response variable and the explanatory variable in this experiment?

(c) What is the type and scale of measurement of the response variable data?

Explanation / Answer

a) This study classifies as an experiment because researcher introduced a new variable i.e. different treatments on pain relief (Medication, diet change and placebo) to check its effect on migraine sufferers.

b) Response variable: Pain relief (No pain relief or some pain relief)

Explanetory variable: Different treatments on pain relief (Medication, diet change and placebo)

c) Response variable type: Categorical

Scale of measurement: Nominal

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