1. Comscore collected data on the apps downloaded to the smartphones of American millennials (adults between the ages of 18 & 34). Respondents were asked which apps they had downloaded to their phone. In a sample of 625 American millennials, 205 had downloaded Snapchat. a. What variable is recorded for each individual sampled? Classify the variable as categorical or quantitative. b. Estimate the proportion of all American millennials who have downloaded Snapchat onto their smartphone with 99% confidence. (Round decimal calculations to four decimal places.) c. If the previous estimate is used and the confidence level remained the same, what size sample should be used to have margin of error within 2.5%? d. Does the interval calculated in part b support that claim that more than 30% of American millennials have downloaded Snapchat? Explain.