Statistics: Sampling Techniques
Random samples - answerare selected by using
chance methods or random numbers.
ex random samples - answerNumber each object in the population; Place the numbered card
in a box and mix
them; Select as many card as needed to form the
sample.
Systematic samples -...
Random samples - answer✔are selected by using
chance methods or random numbers.
ex random samples - answer✔Number each object in the population; Place the numbered card
in a box and mix
them; Select as many card as needed to form the
sample.
Systematic samples - answer✔Numbering each object in the population; Selecting every Kth
value.
ex Systematic samples - answer✔suppose there are 2000 students in an elementary school and
a sample of 50 students is needed.
Solution: give a number to each student. then find k=2000/50=40 and every 40th student would
be selected. Choose randomly the 1st student from 1 through 40.
Stratified samples - answer✔are selected by Divide the population into groups (X {
typically: race, age, gender, religion, education}) Obtain a random or systematic sample of each
X; Put together the samples obtained in the previous
step for your ________.
ex stratified samples - answer✔There are 500 students in a private school in which 350 are
male and 150 are female. We need 11 students from each. Solution males k=350/11=31.81
approximately 31 round down. Then randomly choose 1 from 31. then count from that number
31 times till you get 11 students. same goes for females.
Cluster samples - answer✔are selected by Divide the population into sections "often
geographical"; Obtain a random or systematic sample of each; Put together the samples
obtained in the
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through EFT, credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying this summary from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller Thebright. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy this summary for R186,13. You're not tied to anything after your purchase.
