Na recent flu epidemic, the number of flu cases increased by 40% each week. there were 3,000 flu cases during the first week of january. how many more people were affected by the flu during the third week of january than during the first week?

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.