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 they then use ________.
1) One mean (sigma known)
2) One mean (sigma unknown)
3) Mean of the differences (paired samples)
4) Difference of two means (independent samples)
5) One proportion
6) Difference of two proportions