1) Your friend forgot she was supposed to conduct a poll of your high schools' students. She asks everyone in your homeroom if they think the school should have a new mascot. She presents the results to the student council. This is an example of? (non-sampling error/sampling bias or sampling error)

2) 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? (non-sampling error/sampling bias or sampling error)

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? (non-sampling error/sampling bias or sampling error)