2.) city r is a large city with 4 million residents, and city s is a smaller city with 0.25 million residents. researchers believe that the proportion of city s residents who regularly ride bicycles is between 15 percent and the proportion of city r residents who regularly ride bicycles is 30 percent. in our study, we sample 200 residents from city r and 40 residents from city s. and are these sample sizes large enough to guarantee that the sampling distribution of the difference in sample proportions will be approximately normal? if not, what are the appropriate sample sizes?