One psychological study investigated whether intelligence declines with age. Experimenters took subjects from different age groups, running from late childhood through old age, administered IQ tests to each age group and then looked how the results changed from one age group to an- other. What observation method did researchers use in this study?, Some time later, researcher chose to study whether intelligence declines with age using a differ- ent method. In this study, they chose to study a group of people over a period of decades, ad- ministering IQ tests every few years. What type of observation method did researchers use in this case?

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