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You like to eat tuna sandwiches. Recently you have noticed that there does not seem to be as much tuna as you expect when you open the can. Identify the type of data that this represents and describe how it can or cannot be used to reach a conclusion about the amount of tuna in cans of tuna. Is this anecdotal data, available data, an observational study, or an experiment? Explain your answer.

A. This is anecdotal data. You have noticed that the can of tuna seems lacking, but you have no data to support the claim.
B. This is available data. Because you noticed that there does not seem to be as much tuna as you expect when you open the can, you can conclude that there is less tuna in the can than expected.
C. This is an experiment because the amount of tuna observed is influenced by opening the can.
D. This is an observational study. You opened the can and observed that the amount of tuna in the can is less than the amount expected to be in the can.