Acoin contains
1
.
2
5
1.251, point, 25 grams of nickel and
3
.
7
5
3.753, point, 75 grams of copper, for a total weight of
5
55 grams.
what percentage of the metal in the coin is copper?

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.