Write your answers clearly in 12-pt blue font on the line underneath the problem like this. A researcher wants to know whether wearing high heels is a risk factor for bunions in women. She contacts 2000 women by selecting random phone numbers from the London telephone directory and assesses them for bunions using a standard foot pain and disability index. She recorded the following results. Irregular high heel wearers Regular high heel wearers Bunion 43 No bunion 895 347 715 1. Calculate the overall prevalence of bunions in the population. 2. Calculate the prevalence separately for irregular high heel wearers and regular high heel wearers. 3. Calculate the risk ratio for regular wearers of high heels. Write a sentence interpreting this risk ratio. 4. Calculate the odds-ratio for regular wearers of high heels. Write a sentence interpreting this odds-ratio.

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