Identify the type of sampling bias guaranteed to occur in cach of the sampling schemes, based on the information provided some sampling schemes may incur multiple types of bias. a. a political poll is conducted by contacting people on landline phones. the pollsters did not keep track of how many people they contacted who did not respond. b. a political poll is administered by contacting people on landline phones. the pollsters contacted 5000 households, and 1255 individuals agreed to speak with the caller. a political poll is conducted by asking the listeners of a radio program to call in. a political poll asks the question, "if you found out that candidate a was arrested when he was younger, would that change your opinion of how immoral candidate a is? " select from the following 1. response 2. undercoverage 3. self selection 4. non response

Which scenarios are most effectively explored by conducting an experiment? there is more than one correct answer. select all that apply. researchers want to study the effectiveness of a particular drug for treating migraines. they want to know which dosage of the drug yields the best results with the least side effects. to ensure fair results, the researchers want to ensure that participants and dosage administrators do not know which dosage participants receive. a teacher wants to plan a class fieldtrip and quickly determine where students prefer to go for the class fieldtrip. a car mechanic wants to know which of two engine brands makes better-performing engines. he wants to test the engines in identical situations and rate their performance in a way that can be fairly measured. a chemist studies the properties of a metal compound. she wants to know how the sample size of the metal affects its ability to conduct electricity. she wants to conduct the research in a controlled environment to minimize bias. a realty company wants to know the average income of its clients. the company wants to gather data income from current clients.