1. A conclusion reached on the basis of a correctly applied statistical procedure is based solely on probability.
2. The null hypothesis may be the same as the experimental hypothesis.
3. The "a level" and the "region of rejection" are two expressions for the same thing.
4. If a correct statistical procedure is used, it is possible to reject a true null hypothesis.
5. The probability of rolling two 6's on two dice is 1/6 + 1/6 + 1/3.
6. A weakness of many surveys is that there is little control of secondary variables.