Should marketers use ads that appeal to children to sell adult products? One controversial advertisement campaign was Camel cigarettes' use of the cartoon character "Joe Camel" as its brand symbol. (The Federal Trade Commission eventually banned ads featuring Joe Camel because they supposedly encouraged young people to

:. smoke.) Lucy L. Henke, a marketing professor at the University of New Hampshire, assessed young children's abilities to recognize cigarette brand advertising symbols. She found that 15 out of 28 children under the age of 6, and 46 out of 55 children age 6 and over recognized Joe Camel, the brand symbol of Camel cigarettes (Journal of Advertising, Winter 1995).

a. Use a 95% confidence interval to estimate the proportion of all children that recognize Joe Camel. Interpret the interval.

b. Do the data indicate that recognition of Joe Camel increases with age? Test using a = .05.