A psychologist developed an instrumental enrichment (IE) program, which he claimed to be useful in overcoming cognitive deficiencies in mentally retarded children. To test the program, a random sample of 40 students was selected. An IQ test was given to the students before they spent 2 years in an IE program, and another IQ test was given to the same students after the program. Assuming the measurements are continuous, which statistical test would you suggest to use for the analysis?

		Two-sample t-test
		One sample t-test
		ANOVA
		Dependent t-test