In a Study for Which the Sample Represents the Population

Multiple Choice

In a study for which the sample represents the population of interest but the treatments are not randomly assigned

A) the results can be extended to the population but a cause and effect conclusion cannot be made.
B) the results can be extended to the population and a cause and effect conclusion can be made if the results are statistically significant.
C) the results cannot be extended to the population unless they are statistically significant.
D) the results cannot be extended to the population unless the sample size is large.