A cell phone company claimed that iPhone smartphones are more popular with the younger generation ( age less than 30) than the older generation( age 30 or more). They calculated a 95% confidence interval for the difference between the proportions of the young and old generations that use iPhones Pyong-pold and they got (0.12, 0.25). What would this mean? A. It seems like iPhones are not popular among the younger generations because the percentages are both less than 50% B. We are 90% confident that the proportions of young people who use iPhones is 0.12 and the proportions of those in the older generation that use iPhones is 0.25. C. It looks like iPhones are more popular in the younger generations D. We are 95% confident that the true mean is between 0.12 and 0.25 Part 2: Investors in the stock market are interested in estimating the true proportion of stocks that go up each week. They collect a random sample of 45 stocks and record if they went up that week. They find out that 24 of them went up. Which confidence interval would you use? A. One mean(sigma known) B. One mean ( sigma unknown) C. Mean of differences (paired samples) D. Difference of two means(independent samples) E. One proportion F. Difference of two proportions