The Nord-Trndelag health study surveyed more than 60,000 people in a Norwegian county and reported that gastrointestinal

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The Nord-Trøndelag health study surveyed more than 60,000 people in a Norwegian county and reported that gastrointestinal symptoms, depression, and anxiety disorders are strongly related (Haug, Mykletun, & Dahl, 2002). 

a. What is the sample used by these researchers? 

b. What is the population to which the researchers would like to extend their findings?

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