Q1:
In what sort of sampling does the researcher divide the population into separate groups called strata, then draw a probability sample from each group?
Q2:
Which type of random sample should be used to determine the subject preferences of a group of 400 students given the ratio of males to females is ?
Q3:
Which type of random sample is used for selecting a sample from one strata of society?
Q4:
Which type of random sample can be used to study the level of qualifications in a society divided into lower class, middle class and upper class?