There are 10 boys and 8 girls on the cross-country team. the ratio of boys to girls participating in track and field is proportional to the ratio of boys to girls on the cross-country team.

which could be the number of boys and girls participating in track and field?

a.
12 boys and 10 girls

b.
14 boys and 12 girls

c.
15 boys and 12 girls

d.
16 boys and 14 girls

The investigating team suspected that there were differences in the cost of repairing cars in workshop i and workshop ii. the investigating team suspected that the costs raised by workshop i were greater than workshop ii. for that they tested the repair of 15 cars in each workshop to see the cost of repairs. the decision of the right hypothesis to prove the suspicion above is a. h0 : μ1- μ2­ = 0; ha : μ1- μ2­ ≠ 0 b. h0 : μ1- μ2 ≥ 0; ha : μ1- μ2 < 0 c. h0 : μd ≥ 0; ha : μd < 0 with μd = μ2- μ1 d. h0 : μd = 0; ha : μd ≠ 0 with μd = μ2- μ1 e. h0 : μ1- μ2 = 0; ha : μ1- μ2 ≥ 0