21 patients were tested on a new intervention intended to improve cognitive function. Cognitive function was tested using the MoCA test. A higher score on MoCA is indicative of better function. Each patient's cognitive function was tested before and after the new intervention. Which of the following statements suggests the null hypothesis?a. The MoCA score before the intervention is similar to the MoCA score after the intervention.b. The MoCA score before the intervention is smaller than the MoC

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