20. Madison bought a sweater (originally
$38) and jeans (originally $42). The
sweater was marked down 30% and
the jeans were marked down 15%.
Find the total cost, including the 8%
sales tax.
Round to 2 decimals.
The total cost was $

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.