The owner of an amusement park wants to find out which ride was the favorite among the park’s visitors on a given saturday. on that day, there were 5,500 visitors. the manager choose which sample size is best. arrange the samples starting with the greatest variation from the expected value and ending with the least variation. sample a: a sample of 10 people sample c: a sample of 90 people sample b: a sample of 55 people sample d: a sample of 200 people

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.