You recently sent out a survey to determine if the percentage of adults who use social media has changed from 66%, which was the percentage of adults who used social media five years ago. Of the 2637 people who responded to the survey, 1722 stated that they currently use social media.

Using the data from this survey, a 93% confidence interval estimate of the proportion of adults who use social media is (0.636,0.67)

A. Can you conclude that the percentage of adults who use social media has changed? Explain.

• Yes, because theproportionof adults who used social mediafive years agois insideof the confidence interval.
• Yes, because theproportionof adults who used social mediafive years agois not insidethe confidence interval.
• No, because theproportionof adults who used social mediafive years agois insidethe confidence interval.
• No, because theproportionof adults who used social mediafive years agois not insidethe confidence interval.

B. If it has changed, has it increased or decreased?

• The percentage hasincreased.
• The percentage hasdecreased.
• Wecannot determinethat the percentage haschanged.