Asociologist wants to study how educational credential requirements for employment have changed in the last fifty years in the united states, sweden, and germany by using newspaper classified ads. what research concept best describes this study

Experimental Research Method

Explanation:

According to my research on studies conducted by various Sociologists, I can say that based on the information provided within the question the research study that best describes this study would be an Experimental Research Method. This can be said because the researcher can isolate the effect of race by creating otherwise identical resumes, therefore using and manipulating the variables that are available to him. Which is what the experimental method focuses on.

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is it multiple choice?