If a contingency table shows the sex and classification of undergraduate students (freshman, sophomore, junior, senior) in your statistics class, which of the following is true?
a. The sex of the student is an example of mutually exclusive events.
b. Because yours is an undergraduate class, the events are exhaustive, i.e., each student must fall in one of the classifications.
c. An example for the intersection of events would be the number of males who are juniors.
d. An example for the union of events would be the number of students who are female or juniors.
e. All of these are true.
Question 2
Texas passed a law requiring drivers and passengers in the front seat to wear seat belts. In order to estimate the compliance with the law an unmarked car will operate in a selected county and the officer will observe whether or not seat belts are in use. The proportion complying, , in the county is to be estimated by randomly selecting the cars to examine. A confidence coefficient of 0.98 is desired with the estimate, p, to be within 0.05 of the true proportion. If an average number of cars passing the observation point per day is 12,000, how many cars are needed in this sample?
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