there is strong evidence that the mean test score is not the same for all three

Question

there is strong evidence that the mean test score is not the same for all three groups.

or

A researcher is studying treatments for agoraphobia with panic disorder. The treatments are to be the drug Imipramine at the doses 1.5 mg per kg of body weight and 2.5 mg per kg of body weight. There will also be a control group given a placebo. Thirty patients were randomly divided into three groups of 10 each. One group was assigned to the control, and the other two groups were assigned to each of the two treatments. After 24 weeks of treatment, each of the subject's symptoms were evaluated through a battery of psychological tests, where high scores indicate a lessening of symptoms. Assume the data for the three groups are independent, and the data are approximately Normal. The P-value is less than 0.01. The correct conclusion is that

there is strong evidence that the mean test score is not the same for all three groups.

or

there is strong evidence that the mean test score is higher for both treatment groups than the control.

Explanation / Answer

here as p value is less than 0.01 level we reject null hypotheiss of equal mean; but without post hoc analysis we can nt tell which mean are different

hence correct option :

there is strong evidence that the mean test score is not the same for all three groups

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