What is the ratio of the average number of catfish to the average number of all fish in the samples? StartFraction Average number of catfish over average number of fish EndFraction = StartFraction (3 + 5 + 7) divided by 3 over 20 EndFraction
1:7
1:4
2:5
3:4

According to a study conducted in 2015, 18% of shoppers said that they prefer to buy generic instead of name-brand products. suppose that in a recent sample of 1500 shoppers, 315 stated that they prefer to buy generic instead of name-brand products. at a 5% significance level, can you conclude that the proportion of all shoppers who currently prefer to buy generic instead of name-brand products is higher than .18? use both the p-value and the critical-value approaches.