1. Which of the following is the correct null hypothesis for an independent-measures t test! a. There is no difference between the two sample means. b. There is no difference between the two population means. c. The difference between the two sample means is identical to the difference between the two population means. d. None of the other three choices is correct. 3. One sample has n = 4 and a second sample has n = 8. If the pooled variance for the two samples is 24, then what is estimated standard error for the sample mean difference. a. 9 b. 4 c. 3 d. 2 4. 4. A researcher obtains M = 34 with SS = 190 for a sample of n = 10 girls and M = 29 with SS = 170 for a sample of n = 10 boys. If the two samples are used to evaluate the mean difference between the populations, what will be obtained for the t statistic. a. 5/4 = 1.25 b. 5/2 = 2.50 c. 5/2 = 3.54 d. 5/1 = 5.00