The expected response rate to mail questionnaires by large private survey organizations in the seventies was eighty percent.

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During the seventies, the expected response rate to mail questionnaires by large private survey organizations was typically much lower than eighty percent, often ranging around 30% to 60%, depending on various factors such as the survey's topic, the target population, and the design of the survey itself.

The Expected Response Rate to Mail Questionnaires by Large Private