Even if the research hypothesis is true, an experiment may not produce significant results because
A) sampling error and other uncontrolled variables may result in too little variance in the population.
B) the sample that happens to be selected from the population being studied may not be extreme enough to provide a clear case for rejecting the null hypothesis.
C) the original population has a very extreme mean and standard deviation, leading the researcher to accept the null hypothesis.
D) just as there is a probability of rejecting the null hypothesis, there is always a chance that it must be accepted.
Answer: B
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