A national for-profit hospital chain with hospitals in 20 states wants to survey
ID: 2908919 • Letter: A
Question
A national for-profit hospital chain with hospitals in 20 states wants to survey patient satisfaction. Which of the following is a stratified sample?
Select a day at random, and survey every patient discharged from one of their hospitals that day
Obtain a list of all patients discharged from one of their hospitals over the past 6 months. Divide the patients according to length of stay (2 days or less, 3-7 days, 8-14 days, or more than 14 days). Draw a simple random sample from each of these groups
Randomly select some hospitals from each of five geographic regions, and then select a random sample of discharged patients from each of those hospitals
Put the survey online, and tell every patient being discharged about the website, inviting them to complete the survey.
A.Select a day at random, and survey every patient discharged from one of their hospitals that day
B.Obtain a list of all patients discharged from one of their hospitals over the past 6 months. Divide the patients according to length of stay (2 days or less, 3-7 days, 8-14 days, or more than 14 days). Draw a simple random sample from each of these groups
C.Randomly select some hospitals from each of five geographic regions, and then select a random sample of discharged patients from each of those hospitals
D.Put the survey online, and tell every patient being discharged about the website, inviting them to complete the survey.
Explanation / Answer
ANSWER IS -
(B)Obtain a list of all patients discharged from one of their hospitals over the past 6 months. Divide the patients according to length of stay (2 days or less, 3-7 days, 8-14 days, or more than 14 days). Draw a simple random sample from each of these groups.
Stratified sampling is a sampling technique in which
Whole population is divided into number of strata's and then select sample randomly from each strata.Strata are in such a way that within strata there is homogeneity and between strata there is heterogeneity.
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