1. The data on the following page were taken from a study investigating the associations between spontaneous abortion and various risk factors
Alcohol Pregnancies Spontaneous abortions
0 33164 6793
1-2 9099 2068
3-6 3069 776
7-20 1527 456
21+ 287 98
a. For each level of alcohol consumption, estimate the probability that a woman who becomes pregnant will undergo a spontaneous abortion.
b. For each category of alcohol use, estimate the relative odds of experiencing a spontaneous abortion for women who consume some amount of alcohol versus those who do not consume any.
c. In each case, calculate a 95% confidence interval for the odds ratio.
d. What do you conclude?