In order to determine the effects of smoking on lung cancer, 250 individuals were surveyed, including...
In order to determine the effects of smoking on lung cancer, 250 individuals were surveyed, including 75 who had lung cancer. Of those who smoked, 70 had lung cancer and of those without cancer, 165 did not smoke.
a) Declare the categorical variables and their categories. Make
a contingency table.
b) What percentage of individuals smoke and do not have lung
cancer?
c) What percentage of individuals do not smoke?
d) What percentage of individuals who have lung cancer do not
smoke?
Homework Answers
Ans:
a)
Categorical variables are:
smoke or don't smoke
lung cancer or No lung cancer
| lung cancer | No lung cancer | Total | |
| smoke | 70 | 10 | 80 |
| don't smoke | 5 | 165 | 170 |
| Total | 75 | 175 | 250 |
b)
Percentage of individuals smoke and do not have lung cancer=100*10/250=4%
c)
Percentage of individuals do not smoke=100*170/250=68%
d)
Percentage of individuals who have lung cancer do not smoke=100*5/75=6.67%
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