Question: You would like to know if caffeine supplementation improves mental focus. One group of subjects gets 6 mg of caffeine every morning. Another group receives

You would like to know if caffeine supplementation improves mental focus. One group of subjects gets 6 mg of caffeine every morning. Another group receives a placebo containing no caffeine. Discuss which statistical analysis you would select and why. Indicate your research and null hypothesis for both directional and non-directional

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