Question: Suppose that we conduct a randomized experiment in which we randomly assign half of participants to a control group and randomly assign the other half

Suppose that we conduct a randomized experiment in which we randomly assign half of participants to a control group and randomly assign the other half of participants to a treatment group that watches a video. We then measure support for the president, and support for the president is on average higher in the treatment group than in the control group. The p-value is p<0.05 for a test of the null hypothesis that the mean level of support for the president in the treatment group equals the mean level of support for the president in the control group. Based on this, we can conclude at the conventional level in political science that the difference between the treatment group and the control group was caused ___.

Group of answer choices

A. by random assignment error

B. by the difference in treatment

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