A company that sells tea and coffee claims that drinking two cups of green tea daily has been shown to increase mood and well-being. This claim is based on surveys asking customers to rate their mood on a scale of 1–10 after days they drink/do not drink different types of tea. Based on this information, answer the following questions: How would we know if this data is valid and reliable? What questions would you ask to find out more about the quality of the data? Why is it important to gather and report valid and reliable data?

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