A researcher studying malnutrition among children in a developing country collected weights of a random sample of children using a scale that she had set to give weights 2.5 kilograms less than the actual weight. Which statement best describes this situation?

		Measurement error has not occurred, but the researcher is guilty of unethical statistical practice.
		Measurement error has occurred, but the researcher is not guilty of unethical statistical practice.
		Measurement error has occurred, and the researcher is guilty of unethical statistical practice.
		Measurement error has not occurred, and the researcher is not guilty of unethical statistical practice.