Pew Research Center recently reported that 75% of U.S. adults between 18 and 24 years old use Snapchat. A technology blogger believes that the culture of social media use is changing among these young adults, and makes the following claim in one of her articles. "Young adults now are abandoning Facebook and Instagram in favor of trendier options, like Snapchat. In fact, I am certain that more than 75% of [18 to 24-year-old U.S. adults] use Snapchat, and that this percentage will increase over the next few years." Later, a survey of 356 randomly selected U.S. adults in this age group revealed that 284 of them use Snapchat.

Part a :Using this survey, test the blogger's claim that more than 75% of U.S. adults in this age group use Snapchat. Use a significance level of = 0.05.

Part b:Using your result from part a decideand explain with a reason what type of error can occur and what would be the consequence of this error?