Which of the following show a proper formulation of the Ho and the Ha for a one-tailed test of the mean? A. H0: $18,500, Ha: < $18,500 B. H0: = $18,500, Ha: $18,500 C. H0: > $18,500, Ha: $18,500 D. Responses A and C are proper formulations for one-tailed tests of the mean