Compared with _____ data, two disadvantages of _____ data are that the latter is usually far more time consuming and more expensive to collect.

Compared with _____ data, two disadvantages of _____ data are that the latter is usually far more time consuming and more expensive to collect.



A.

secondary

primary


B.

primary

secondary


C.

differential

observational


D.

sample

population



Answer: A


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