1. The CDC reported that 16% of college-aged individuals used vapes in 2016. Researchers recently surveyed 800 of college-aged individuals. What is the probability that more than 17% will use vapes?
2. How many middle school students must we survey to estimate the percentage that have experienced bullying? We want to be 95% confident that our estimate is within 45 of the population percentage. a. 13 students b. 24 c. 601 d. 306
3. In the 2018 midterm elections, 36% of 18-24-year-olds voted. A political analyst claims that a higher percentage of this age group will vote in the 2020 presidential election. He surveyed 650 18-24-year-olds and 249 said they intend to vote in 2020. Use 0.05 significance level to determine if the claim is valid. Ho = , Ha=, z-stat = , p-value= , decision