A researcher wanted to know whether exercise could alleviate depression. Using Kruskal-Wallis test, the researcher finds the calculated H is smaller than the critical value. What is the correct conclusion from the test result?   a. Reject Ho. Exercise does not affect depression level.   b. Accept Ho. Exercise does not affect depression level.   c. Reject Ho. Exercise affect depression level.   d. Ho cannot be rejected. Exercise does not affect depression level.

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