Many companies are finding that customers are using various types of online content before purchasing products. The following results are the percentages of adults and youths who use various sources...

Many companies are finding that customers are using various types of online content before purchasing products. The following results are the percentages of adults and youths who use various sources of online content. Suppose the survey is based on 100 adults and 100 youths.

For “Customer product ratings/reviews” and “For sale listings with seller ratings” determine whether there is a difference between adults and youths in the proportion that use the type of online content at the 0.05 level of confidence.