ronald has 2 quarters, 4 dimes, 3 nickels, 6 pennies in his pockets. without looking, he pulls a coin out of his pocket. what is the probability that he pulls out a nickel?

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.