7. For each unit increase in the air pollution index, on average the number of admissions for respiratory distress (a) increases by about 0.88 (b) increases by about 13.6 (c) increases by about 10.4 (d) decreases by about 16.2 (e) changes by an indeterminate amount 8. For days on which the air pollution index is 5.5, the average number of admissions for respiratory distress is predicted to be about: (a) 58.6 (b) 91 (c) 74.8 (d) 10.4 (e) 31.2 9. The coefficient of determination, which gives proportion of the variability in the number of admissions for respiratory distress that is accounted for by the level of air pollution, is about: (a) 0.10 (b) 0.88 (c) 0.78 (d) 0.14 (e) 0.93

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