Identify which of these types of sampling is used simple random stratified systematic or convenience 49 students are selected at

Question

Identify which of these types of sampling is used simple random stratified systematic or convenience 49 students are selected at random from the Saphomore class 39 from the Junior Class and 48 from the Senior Class A sample consists of every 20th student who leaves the library A pollster uses a computer to generate 500 random numbers then interviews the voters corresponding to those numbers A researcher interviews 19 work colleagues who work in his building Systematic Convenience Stratified Simple Random SP 4

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