His savi What is
• The tennis racket normally costs $43.
• All tennis rackets are marked down 15%.
• One can of tennis balls normally costs $4.
• The tennis balls are not marked down.
• The sales tax rate is 8.5%.

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.