Last school year, the student body of a local university consisted of 30% freshmen, 24% sophomores, 26% juniors, and 20% seniors. a sample of 300 students taken from this year's student body showed the following number of students in each classification: freshmen 83, sophomores 68, juniors 85, and seniors 64. the school superintendent is interested in determine whether or not there has been a significant change in the classification between last school year and this school year. the expected number of freshmen is reference student body problem statement above, which of the following is a correct statement if the hypothesis to be tested at the 5% level of significance? select one: a. the null hypothesis should state that the classification for this school year is independent of last school year classification b. the alternative hypothesis should state that the classification for this school year is independent of last school year classification c. the null hypothesis should be pfreshmen=0.30, psophomores=0.24, pjuniors=0.26 , pseniors=0.20 d. the alternative hypothesis should be pfreshmen=0.30, psophomores=0.24, pjuniors=0.26, pseniors=0.20 e. none of the above answers is correct