Ms Jones buys 3 pizzas and 3 bottles of soda for her 2nd period class for 23.34. She buys 4 pizzas and 3 bottles of soda for her 6th period class for 32.70. How much does each pizza and soda cost?

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.