Anyone good at stats ... its very basic?

Sample Methods: Health Care. Modern Managed Hospitals (MMH) is a national for-profit chain of hospitals. Management wants to survey patients discharged this past year to obtain patient satisfaction profiles. They wish to use a sample of such patients. Several sampling techniques are described below. Categorize each technique as simple random sample, stratified, systematic sample, cluster sample, or convenience sample.


(a) Obtain a list of patients discharged from all MMH facilities. Divide the patients according to length of hospital stay (2 days or less, 3-7 days, 8-14 days, more than 14 days). Draw simple random samples from each group.


(b) Obtain lists of patients discharged from all MMH facilities. Number these patients, and then use a random-number table to obtain the sample.


(c) Randomly select some MMH facilities from each of the five geographic regions, and then include all the patients on the discharge lists of the selected hospitals.

Anyone good at stats ... its very basic?
(a) is a stratified sample (the strata are the length of stays and then a simpe random sample is taken from each strata)





(b) is a simple random sample





(c) is a cluster sample (the clusters are the geographic region and all observations in each randomly selected cluster are selected)





(d) is a systematic sample (every 500th is selected)





(e) is a convenience sample (no obvious randomization is put into selecting the sample)