9. A high school principal from Southwest H.S. is concerned with the amount of time her students devote to working at an after school job. She randomly selects 25 students and asks them to report how many hours they work per week. The principal determines that that the mean number of hours worked per week is 12.3. The principal claims that the mean number of hours worked by the students sampled from her school is significantly more than the national mean of 10.7 hours worked per week by high school students reported in a study published by the National Association of Secondary School Principals (NASSP). The standard deviation for the national average (population) of hours worked obtained from the NASSP study is 2.5. This principal did not take EDCI 501 and does not have a good understanding of statistics so she asked an educational statistics professor to analyze the data that she collected. What analysis would the professor conduct to determine if average number of hours that students are working at Southwest H.S. is significantly higher than the mean number of hours worked by high school students nationally? IV: DV: Analysis: Rationale