The manufacturer of a national name-brand ketchup asked a sample of 100shoppers whether they believed hat supermarket brand ketchup was asgood as the national brand ketchup. Out of the 100 shoppers surveyed, 52stated that the supermarket brand was as good as the national brand. Atthe 90% confidence level, what is the margin of error for this survey? a. 3% b. 5% c. 8%