In 2021, the Pew Research Center published a report entitled "Social Media Use in 2021." The report presented the results of a survey of a nationally representative sample of 1,502 U.S. adults contacted via telephone. According to the report "A majority of Americans say they use YouTube and Facebook, while use of Instagram, Snapchat and TikTok is especially common among adults under 30."

1. Who do you think the population is for the Pew Research Center study described above? Please explain.

2. Who are the individuals in this study?

3. We are told the sample is "nationally representative." What do you think this means, and why is it important? Please explain.

4. Interestingly, also in 2021, a company from the United Kingdom called BrandFormula also published a social media report. They mentioned that they posted a poll question on their Twitter and LinkedIn accounts in order to find out which social media platform their followers use most often. what sampling method does it appear that BrandFormula used? Please explain.

5. In the BrandFormula survey, the majority of respondents said they use Instagram most often. A critic of this survey says that we should not trust the survey results because the study is biased. What exactly does it mean if we say the design of statistical study is biased?