Brian claims that his dog can do single-digit multiplication. he shows the dog 10 cards with simple multiplication problems that are either correct or incorrect. the dog correctly identifies the correctness of the card 7 times out of 10. if the dog were simply guessing, how many would the dog be expected to get correct? 3 5 7 10

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.