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2 marks) The following data represent the results of a simple study of physiotherapy patients. At the start of therapy, each patient was asked to rate their pain as either Mild or Severe. The study examined whether they regained full range of motion after 6 months of therapy. Determine if there is evidence to suggest a statistically significant difference in the healing rates of the patients who experienced mild vs. severe pain at the 5 % two-sided significance level.You may use any analysis strategy of your choice.

Regained Motion

Did Not Regain

Motion

Mild

70

35

Severe

40

20

What is your conclusion?

a.

The mild pain sufferers have regained motion at a significantly higher rate than severe pain sufferers.

b.

The severe pain sufferers have regained motion at a significantly higher rate than mild pain sufferers.

c.

There is no evidence to suggest a statistically significant difference in recovery rates between the two pain groups.

d.

A correct answer requires additional information.