Can some one help me on this questions

In comparing the cost of repairs to small electrical appliances two groups of repair facilities are studied: large retail stores (population I), and smaller private repair shops (population II). It is felt that even though the mean repair costs may be the same for these two populations, there is a difference in variability.
a. Set up the null and alternative hypotheses needed to gain statistical evidence that the population variances are not the same.
b. Random samples of 30 appliances repaired at each of the above type of facilities are obtained. The respective sample variances were s12 = 25 and s22 = 16. What is the P value for the test? Do you think that H0 should be rejected?