Simple random samples of these plots were selected within each region (Fig.
Survey data were analyzed by region as simple random samples, except British Columbia, where the sample design was stratified with optimum allocation of effort and could not be treated as a simple random sample.
For the 6 regions with simple random samples, new plots may be appended to the sample if desired.
Thus, these data represent complex samples rather than simple random samples.
root design effect [DEFT] and design effect [DEFF]) measure the impact of the departure of the study's complex sample design from a simple random sample design.
Because each item in a population has an equal probability of selection on a given draw, simple random samples are considered to be highly representative.
A simple random sample may be selected either with replacement or without replacement.
If a simple random sample were used, you would have no assurance (due to sampling error) that the floor plan mix of the sample would be identical to the floor plan mix of the population.
All groups are simple random samples from their respective populations.
Each group is a simple random sample from its population.
With a sampling distribution, we can consider how such statistics as the mean or the variance may vary from sample to sample if we draw repeated simple random samples of the same size from the same population.
Thus, cluster sampling is usually more efficient than simple random sampling when the population to be sampled is scattered over a wide area and considerable travel costs would be involved in drawing the simple random sample.