Statistics for Business: Decision Making and Analysis, 3rd Edition

Think About It

1. 21. Independent. It is unlikely that seeing a Honda, for example, would make us suspect that the next car was also a Honda.

2. 23. Dependent. The number of visits today is probably influenced by the same factors that influenced the number of visits yesterday.

3. 25. Most likely independent

4. 27. Independent. If A happens, then the chance for B remains one-quarter because B is one-quarter of the area of A.

5. 29.

   1. Classify everyone as a drug user.

   2. The problem is that the test will not be very specific.

6. 31. No. The statement of the question first gives P(F|Y) = 0.45 and then P(Y|F) = 0.45. In order to be independent, P(F|Y) = P(F), but we are not given P(F).

7. 33.

   1. 0.42 = P(working affected grades|have loan). The sample space might be the collection ...