A study was conducted to investigate the effect of an intervention protocol on IQ tests.Nine randomly selected students were tested. $$\begin{array} { l c } \text { Before } & \text { After } \ 100 & 106 \ 111 & 112 \ 93 & 95 \ 92 & 90 \ 99 & 107 \ 85 & 100 \ 117 & 126 \ 110 & 105 \ 98 & 110 \end{array}$$ Set up the null 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 is 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 is 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 is shifted to the left or right of the probability distribution of the test scores after the protocol.

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Quizplus · Accepted Answer

The null hypothesis (H0) typically states that there is no effect or no difference. In this context, it means that the intervention protocol does not change the distribution of test scores, so the distributions before and after are identical.

A Study Was Conducted to Investigate the Effect of an Intervention