Poor performing stocks are eventually removed or consolidated in a national stock exchange. This is an example of O Self-selection bias O Undercoverage bias O Survivorship bias O Sample size bias Airline companies are interested in the consistency of the number of babies on each flight, so that they have adequate safety equipment. Suppose an airline conducts a survey. Over Thanksgiving weekend, it surveys 6 flights from Boston to Salt Lake City to determine the number of babies on the flights. It determines the amount of safety equipment needed by the result of that study. Which of following are examples of bias in this sample? There can be more than one. O The sample included 6 flights, and they should have only sampled a single flight. The sample was only taken on flights from Boston to Salt Lake City so it may not be representative of the population. The sample included all babies on the flight, and they should have randomly selected a few. The sample was taken only during the Thanksgiving holiday so more babies were likely to be traveling