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2. The data in the table below were collected as part of an investigation into the incidence of pneumoconiosis among coal miners. A sample of 18282 coalminers who were known to be smokers but showed no radiological abnormality were grouped by and classiied according to whether or not they showed signs of breathlessness. Breathlessness Yes No Total 29 48 3695 3743 3049 612 8951 9563 50+ 1561 3415 4976 2221 16061 18282 a. Do you think the incidence of breathlessness among the coalminers depend on their age? b. What is the relative risk of breathlessness among coalminers aged 55+ when compared to those aged 29? When compared to those aged 30-49