Learn how representative samples and random samples differ and why combining them minimizes sampling bias for accurate data.

Sampling allows archaeologists to draw conclusions about a site or region using only a fraction of the area. Because excavation is destructive and funding is limited, leaving parts unexcavated can be ...

Suppose that the sample of students described in the previous section was actually selected using stratified random sampling. In stratified sampling, the study population is divided into ...

where is the true probability of observing the jth response level in the ith population. The product multinomial distribution is simply the product of two or more individual multinomial distributions ...

The first wave of the study was conducted with a random stratified sample of individuals who applied to Birthright Israel in the years 2001-2004. Full sampling and other methodological details. The ...