20 pts Do singers of di erent voice parts have di erent heights? The observations were made in 1979 on heights in inches of male singers of the NY Choral Society. MTB oneway c1 c2; SUBC tukey. What test has been performed here? What are the hypotheses H0 and H1 ? What are general assumptions necessary for the above procedure to be valid. What is your decision about H0 and H1 at = 0:05? Give the orderings of the population means according to the tukey procedure. Is H0 : 2 = 4 a contrast?