Question

Determine if the following sampling is independent or dependent. To determine if firstborn children are more intelligent than their younger siblings a sociologist selects 10 pairs of siblings and compares the IQ of the firstborn to the IQ of the younger sibling. An urban economist believes that commute times to work in the South are less than in the Midwest. He randomly selects 40 employed individuals from each region and determines their commute tins

Answer 1

Answer

(A) it is not provided in the question whether the sociologist selected random 10 pair or first 10 pairs of siblings. So, we will consider it as a case of non random sampling and we can say that the sample is dependent because firstborn and sibling in each pair are dependent. So, this sample is dependent.

(B) it is a case of independent sampling because random sampling is used to select 40 people from each region and those 40 people from each region are also independent of each other. So, this sample is independent sample.