QUESTION 6a

Calculate percent frequencies and observed/expected ratios in the table below:

Types of Illness Wet Areas

Population Illness % 		Dry Areas

Population Illness % 		O/E Ratio
Birth defects 120 births 24 176 births 12
Nervous breakdowns 149 adults 13 510 adults 7
Urinary disease 314 total 22 826 total 21
Asthma 314 total 14 826 total 11
Hyperactivity 127 children 11 316 children 2

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