Professor Newberg decided to study preferences of living senior adults, so he visited a local retirement village and invited residents 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 an important aspect of ensuring that survey results are representative of the larger population. Without a random sample, the survey results may be biased or not accurately reflect the preferences of senior adults in general.

Professor Newberg Decided to Study Preferences of Living Senior Adults