Simon is planning to do research using first-year university students from three different universities. He gets a list of all the first-year students in each university. Simon discovers that University A has 500 first-year students, University B has 1,000 first-year students, and University C has 2,000 first-year students. If he selects 50 students from University A, 100 students from University B, and 200 students from University C, Simon is using a selection technique called ______ sampling. systematic cluster stratified convenience Question 25 3 Points ______ is to a true experiment as ______ is to a quasi-experimental design. Random assignment; self-assignment Control; systematic difference A dependent variable; a participant variable Causation; inferential Question 26 3 Points Horace is interested in the effect of age on driving ability. He decides to test people from different age groups (20s, 50s, 80s) for their number of errors on a driving course. Which type of experiment is this? a randomized factorial design a quasi-experimental design a mixed-group design a true experiment Question 27 3 Points Following a true experiment, we are able to conclude that ______. differences may be due to the treatment condition or the initial differences between participants any difference between the groups