On tuesday, 525 people bought tickets to the county fair. tickets cost $7 for adults and $3 for children. the total revenue from ticket sales on tuesday was $2775. the system of equations below represents the number of people and total sales for the county fair on tuesday, where x represents the number of child tickets and y represents the number of adult tickets. how many adult tickets were sold on tuesday? a.340 b.280 c.225 d.300

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.