Professor Newberg decided to study preferences of living senior adults, so he visited a local retirement village and invite dresidents to participate in a lengthy survey. Professor Newberg's survey results are probably invalid because he did not use:

Question

Quizplus · Accepted Answer

Random selection of participants is important in order to ensure that the sample accurately represents the population being studied. Without random selection, there may be bias or other factors that could affect the results and make them invalid. The other options (A, B, and C) are also important in research, but not as critical as random selection for ensuring validity.

Professor Newberg Decided to Study Preferences of Living Senior Adults