In several of the following exercises, you are asked to identify the type of data that is described. Possible answers include anecdotal data, available data, observational data that are from sample surveys, observational data that are not from sample surveys, and experiments. It is possible for some data to be classified in more than one category.
3.9 A dissatisfied customer.
You like to eat tuna sandwiches. Recently you noticed that there does not seem to be as much tuna as you expected when you opened 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 the cans.
3.9
This is anecdotal. You have just noticed that the can seems lacking and there are no real data to support the claim. If you wanted to collect data to test your theory you could measure the contents of a random sample.