A sample of 1,200 individuals arrested for driving under the influence of alcohol was ­obtained from police records. The research recorded the gender, socioeconomic status (from ­occupation information), and number of previous alcohol- related arrests. These data are shown here:

Separately for each socioeconomic status group, answer the following questions.
a. Is there significant evidence of a difference between males and females with ­respect to the number of previous alcohol- related arrests?
b. Compute the odds of having a previous alcohol- related arrest for both males and females. Interpret these values.
c. Compute the odds ratio of having a previous alcohol- related arrest for males vesus females, and place a 95% confidence interval on the odds ratio. Interpret the interval.
d. Compare the results for the three socioeconomic statuses.

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Socioeconomic Status Number of Previous Alcohol-Related Arrests 0 1 or more 0 1 or more 0 1 or more Male Female 130 70 101 110 90 105 95 90 110 Low Medium 80 120 High