:a school psychologist wants to test the effectiveness of a new computer method for teaching reading to first graders. she recruits 400 first grade students in her school district and randomly divides them into two groups. group 1 is taught by means of the new computer method, while group 2 is taught via the traditional method. the same teacher is assigned to teach both groups. at the end of the year, an achievement test is administered and the results of the two groups are compared.
what is the response variable in this experiment? 0 a. the students' ability in mathematics b. the score on the achievement test o c. the score of group 1 on the achievement test d. the score of group 2 on the achievement test

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.