Question 7 3 pts The examinations in a large history class are scaled after grading so that the mean score is 50. A self-confident teaching assistant thinks that his students have a higher mean score than the overall class. His twenty students this semester can be considered a sample from the population of all students he might teach, so he compares their mean score with the mean score of all history classes. If the test statistic is z = 1.844, at the 5% significance level, perform a p-value test and answer the following: Hypotheses Ho: [ Select ] [ Select ] 50 HA: [ Select ] [Select ] 50 P-value: [ Select ] Decision & interpretation: [ Select ] [ Select ]