The report “The New Food Fights: U.S. Public Divides Over Food Science” (December 1, 2016, pewinternet.org, retrieved December 10, 2016) states that younger adults are more likely to see  foods with genetically modified ingredients as being bad for their health than older adults. This statement is based on a representative sample of 178 adult Americans age 18 to 29 and a representative sample of 427 adult Americans age 50 to 64. Of those in the 18 to 29 age group, 48% said they believed these foods were bad for their health, while only 38% of those in the 50 to 64 age group believed this. 

a. Are the sample sizes large enough to use the large-sample confidence interval to estimate the difference in the population proportions?

b. Estimate the difference in the proportion of adult Americans age 18 to 29 who believe the foods made with genetically modified ingredients are bad for their health and the corresponding proportion for adult Americans age 50 to 64. Use a 90% confidence interval.

c. Is zero in the confidence interval? What does this suggest about the difference in the two population proportions?