Another mistaken poll Prior to the mayoral election discussed in Exercise 15, the newspaper also conducted a poll. The paper surveyed a random sample of registered voters stratified by political party, age, sex, and area of residence. This poll predicted that Amabo would win the election with 52% of the vote. The newspaper was wrong: Amabo lost, getting only 46% of the vote. Do you think the newspapers faulty prediction is more likely to be a result of bias or sampling error? Explain.
Histogram Divide data o Equal width o No overlapping Bar chart o Skew pulls direction of mean o Symmetric Numeric Summary Center, spread, and location Greek letters for population Roman letters for statistics 1. Mean µ= population mean x bar= sanple mean o ∑ Xi all over n= sample mean k=0 2. Mean vs. Median a. Mean used the most b. N is small when outliers occur c. Use median, mean is too affected Spread 1. Range (MaxMin) a. Sensitive to outliers 2. IQR a. Not sensitive to outliers Variability XiX bar