A Community based study of respiratory illness during the first year of life was performed in Central India. The following table represents the data according to the socio-economic status, the number of children, and the number of children who developed the symptoms of respiratory illness.

Socio-economic status	Low	Medium	High
Number of children	50	100	100
Number of children with illness	10	10	5

This data was collected through the face to face interview involving team of pediatricians and social scientists. The community belonged to the rural area in Central India (State of Chhattisgarh) in which there were 1500 households. A total of 100 households were selected with fifty each from left and right to the main lane of the community. To facilitate the process of interview, interviewers collected information through a validated questionnaire in local language which was pilot tested in the community. Based on the above information answer the following questions.