Prоblem 9 (6 pоints): Suppоse а consumer аdvocаcy group would like to conduct a survey to find the proportion of consumers who bought the new vacuum cleaner were happy with their purchase. The advocacy group took a random sample of 800 consumers who recently purchased the vacuum cleaner and found that 650 were happy with their purchase. Find and interpret a 95% confidence interval for the population proportion of consumers who were happy with their purchase.