What is the population? What is the sample from which the information is actually obtained?

Question

Pregnant and breastfeeding women should eat at least 12 ounces of fish and seafood per week to ensure their babies optimal brain development, according to a coalition of top scientist from private groups and federal agencies. A nutritionist wants to know whether pregnant women are eating at least 12 ounces of fish per week. To do so, she obtains a list of the 340 members of a local chain of prenatal fitness clubs and mails a questionnaire to 60 of these women selected at random. Only 21 questionnaires were sent back.

Answer 1

A population is the group from which a sample is selected so here the population is the 340 members (even though this is not a representative sub-population of all pregnant and breastfeeding women.)

 

The sample is the 21 returned. Also not a true random sample in this case.

 

 

Need mofe explanation comment back.

 

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