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
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