Celeste wants to have her hair cut and permed and also go to lunch. she knows she will need $59. the perm costs twice as much as her haircut and she needs $5 for lunch. how much does the perm 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.