A study is done to determine if students in the California state university system (sample 1) take longer to graduate, on average, than students enrolled in private universities (sample 2). Suppose that from years of research, it is known that the population standard deviations are 1.5 years and 0.9 years, respectively. One hundred students from each the California state university system and private universities are surveyed. The California state university system students took on average 4.8 years while the private university students took on average 4.4 years. Conduct a hypothesis test, using =0.10.
I need to z score and p value!