Imagine a researcher wants to determine whether a given drug has any effect on the scores of human subjects performing a task of ESP sensitivity. He randomly assigns his subjects to one of two groups. Nine hundred subjects in group 1 (the experimental group) receive an oral administration of the drug prior to testing. In contrast, 1000 subjects in group 2 (control group) receive a placebo. Two sample significant test. The results of the study were:
For the drug group, the mean score on the ESP test was 9.78, S. D. = 4.05, n = 900
For the no-drug group, the mean = 15.10, S. D. = 4.28, n= 1000
a. State your hypothesis.
b. State the standardize error.
c. State the z statistic.
d. State your conclusion.