PSYC 2018H Lecture Notes - Lecture 10: Flextime, Random Assignment, Internal Validity
26 Nov 2017
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Applied research: has direct and immediate relevance to the solution of a real-world problem: builds a lot on basic research. Non-equivalent control group designs: quasi-experimental design in which participants cannot be randomly assigned to the experimental and control group: experimental group: Non-equivalent control group designs: hypothetical example. Something happened to everyone that made them more productive (first graph) Cant be sure it was an effect of the flextime. To evaluate the effect of special program to improve the spelling of second graders weak in spelling, a researcher completed a nonequivalent control group design. 20 students known to be poor spellers were identified and placed in an experimental group. Another 20 students were randomly selected from second grade classes and placed in a control group. The pretest and posttest measures of spelling ability were lists of 40 spoken words that had to be written down by the students.
