Interval Estimation of a Population mean: population standard deviation unknown: 1. A survey of 30 prospective students showed that 70% would University of Indonesia Make an estimate of 99% confident level for the proportion of prospective students who will vote University of Indonesia 2. The study was conducted on 20 samples of University of Indonesia Management Department students from a population of 1000 students to find out their average expenditure in one month. Of the 20 students, it was found that the average monthly expenditure was IDR 500,000 with a standard deviation of IDR 100,000. With a 95% confidence interval, estimate the monthly average expenditure interval for all University of Indonesia Management Department students. Selecting a Sample: 3. Describe the difference between a sample with a limited population and a sample with an unlimited population along with each example