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Which of the following researchers outlined threats to internal validity many years ago?
Q32: The following are advantages to between subjects
Q32: Normal distributions are symmetrical.
Q33: Recently, the Mozart effect was studied by
Q33: The mode is the most frequently occurring
Q41: Quota sampling occurs when every k<sup>th</sup> person
Q45: Have you ever played a video game
Q55: The two main types of sampling procedures
Q56: Which of the following is an advantage
Q66: Regression to the mean is a mathematical
Q84: The four types of probability sampling procedures