A Study Was Conducted to Investigate the Effect of an Intervention

Multiple Choice

A study was conducted to investigate the effect of an intervention protocol on IQ tests.Nine randomly selected students were tested. Set up the alternative hypothesis for the claim that the intervention protocol is effective in increasing scores.

A) H₀: The probability distribution of test scores before and after the intervention protocol is identical.
B) H₀: The probability distribution of test scores before the protocol has shifted to the left of the probability distribution of the test scores after the protocol.
C) H₀: The probability distribution of test scores before the protocol has shifted to the right of the probability distribution of the test scores after the protocol.
D) H₀: The probability distribution of test scores before the protocol has shifted to the left or right of the probability distribution of the test scores after the protocol.