The National Health Interview Survey is conducted annually by the Centers for Disease Control and Prevention. By examining information gathered from a national sample of 600 respondents throughout the United States, it was able to announce that 11.3 percent of all Americans adults under age 65 lacked health insurance. To make this statement, the Centers for Disease Control and Prevention used:

Questionnaires

Explanation:

They allow both government and outside researchers to obtain estimates of a variety of health related topic or issue among either the entire nation or specific demographic group of the population.

And the survey design is cross section.

answer; (c); to assure that workers have the right to a safe workplace and that it is the employer's responsibility to provide safe and healthy workplace;

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