ABSTRACT
This chapter focuses on certain assumptions on the population that a random sample is drawn from are valid, then a certain precision can be made as to how a sample statistic can be used to estimate or make inferences about a population parameter. In United States’ newspapers the results of a survey are often printed with the sample proportion, the sample size, and a margin of error. The confidence level is almost always missing but can be inferred from the pieces of information. The margin of error is composed from two factors. The multiplier depends on the level of confidence–the more confidence, the bigger the multiplier, hence the bigger the margin of error. This should make sense, if there were more room for error then there should be more confidence. The binomial distribution can be used to find a confidence interval for the median for any continuous parent population.
