the graduate record exam (GRE) is a standardized test required to be admitted to many graduate schools. a high score in the GRE males admission more likely. According to the educational testing Service,the mean score for takers of GRE who do not have training courses is 555 with the standard deviation of 139. brainpower Philippines (BP) offers expensive GRE training courses, claiming their graduate score better than those who have not taken any training courses. to test the company's claim, you as a statistician randomly selected 30 graduates of BP and ask their GRE scores. The random sample of 30 graduates he obtains recorded a mean score of 560 GRE. Formulate the null and alternative hypothesis,then identify the test statistic to be used