John counted the number ofboys and girls born in a week 23 boys and 11 girls john said there were twice as many girls as boys born in a week john is wrong what's the answer

Identify all the cases where non-probability sampling is used when attempting to study the characteristics of a large city. studies on every subject in the population divide a population in groups and obtain a sample studies with a limited amount of time demonstrate existing traits in a population studies with the nth person selected