answer questions using sampling error, voluntary response bias, undercoverage bias or sponsorship bias

Instructions: Identify the type of bias for each scenario. 1. A pollster randomly selects a proportional amount of Democrats and Republicans to be in a sample, but does not include any other parties. The results are used in an article about what Americans think. This is an example of 2. A researcher decides to use chister sampling. Penguins are groups based on species and then three groups are selected to be in a study. The other species are not represented in the sample. This is an example of 3. A successful company hired a new research firm to test the effectiveness of their new fitness workout. The researcher firm told the researchers conducting the study that they really needed to retain the company as a client for future business. The researchers created tests that were favorable to the companies desired results. This is an example of