The president of a certain university receives a salary that is four times the salary of one of the department heads. the total of the two salaries is $210,000. a) what is the salary of the department head? b) what is the salary of the president of the university

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.