Ten community colleges in the United States are randomly selected and all of the students at those colleges are surveyed

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Ten community colleges in the United States are randomlyselected and all of the students at those colleges aresurveyed.
a) cluster
b) convenience
c) systematic
d) stratified
e) simple random
In a nationwide study of registered voters conducted by The NewYork Times, 390 people are randomly selected out of thoseregistered Republicans, 430 people are randomly selected out ofthose registered as Democrats, 180 people are randomly selected outof those registered as independents.
a) cluster
b) convenience
c) systematic
d) stratified
e) simple random
A teacher writes the names of her students on slips of paper.Then she puts the slips in a hat, mixes them, and selects 5 of themwithout looking.
a) cluster
b) convenience
c) systematic
d) stratified
e) simple random
To conduct a study on depression among the elderly, a sample of30 patients in one nursing home was used.
a) cluster
b) convenience
c) systematic
d) stratified
e) simple random
A researcher randomly selects the 73rd car fuel tank on anassembly and then ever 100th tank after that.
a) cluster
b) convenience
c) systematic
d) stratified
e) simple random