Joy is collecting rocks. she has 3 jars and 4 buckets. there are 2 rocks in each jar and 3 rocks in each bucket. how many rocks does joy have? a.6 b.10 c.12 eliminate d.18

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.