Answer:It doesn't present information from an unbiased source.
Explanation:
The survey research is based solely on one business or company which conducted this survey and McDonald is a company that sells food which may be critized by health experts as the kind of food which when is eaten constantly will result to obesity.
Chances are when a company conduct a survey which may affect the operation of their own business it is very likely that they may distort the results to ensure this doesn't stab them at the back.
No one will wants to say anything that may jeopardize their own operation and probably put them out of business or lower the number of their customers .
Answer: The city was the place where everything first started.
The researchers kept their identities secret because, if they had revealed that their purpouse was to conduct an experiment on the behaviours of the people in the bar, it might have triggered that some people changed their usual attitudes because they know that their 'figures' will be kept in a record.
Maybe some people will drink less as they feel embarrased if some other person is testing how many beers they end. Others, might want to prove themselves 'strong' and drink much more than usual. People change their behaviour sometimes when they are aware that they are watched. This is called the observer effect.
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