1. The test used to reach a decision about the null hypothesis when the population variance is unknown is the test. 2. The more degrees of freedom, the closer a t distribution is to the distribution. 3. The symbol S2 represents the (In words). 4. In the formula (M - u) / SM, SM is the (Describe in words.) 5. If the mean of a sample is 95, the mean of Population 2 is 75, and the standard deviation of the distribution of means is 5, the t score resulting from a t test for a single sample is (Give a number.) 6. Before conducting a t test for dependent means on a set of pretest and posttest scores, the two sets of scores must be combined into one set of scores by figuring 7. When carrying out a t test for dependent means with a mean difference score of 24 and a variance of the distribution of means of 16, the t score is (Give a number.)