Five siblings have a combined age of 195 years the oldest is 13 years older than the youngest mark the middle child and it's five years younger than josie the other two siblings are six years apart if the second oldest child is 42 what are the ages of the siblings

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.