. 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?