Desmond Thinks His New Tutoring Methods Are Highly Effective Compared

Multiple Choice

Desmond thinks his new tutoring methods are highly effective compared to commercially available methods.He selects the worst students in his statistics class and tries his new tutoring strategy.Which statement describes a threat to the validity of his hypothesis even if the students do very well after the tutoring sessions?

A) Instrumentation errors will skew the results.
B) Regression to the mean is likely to occur.
C) Confirmation bias is likely to occur.
D) The testing sequence is a confounding factor.