5. Find the estimated standard error for the sample mean for each of the following samples. a) n= 9 with SS=1152 b) n= 16 with SS= 540 c) n= 25 with SS= 600 6. Explain why t distributions tend to be flatter and more spread out than the normal distribution. 7. Find the t values that form the boundaries of the critical region for a two-tailed test with for each of the following sample sizes: a) N=4 b) N=15 c) N=24 8. The following sample was obtained from a population with unknown parameters. Scores: 13, 7, 6, 12, 0, 4 a) Compute the sample mean and standard deviation. (Note that these are descriptive values that summarize the sample data.) b) Compute the estimated standard error for M. (Note that this is an inferential value that describes how accurately the sample mean represents the unknown population mean.) 9. To evaluate the effect of a treatment, a sample is obtained from a population with a mean of = 30 and the treatment is administered to the individuals in the sample. After treatment, the sample mean is found to be M= 31.3 with a standard deviation of 3. a) If the sample consists of 16 individuals, are the data sufficient to conclude that the treatment has a significant effect using a two-tailed test with .05 ? b) If the sample consists of 36 individuals, are the data sufficient to conclude that the treatment has a significant effect using a two-tailed test with .05 ? c) Comparing your answer for parts a and b, how does the size of the sample influence th