A researcher is conducting a longitudinal study on how age affects the learning of a new language. In this study,

A researcher is conducting a longitudinal study on how age affects the learning of a new language. In this study, age is a factor that differs for each participant. The learning capacity of each participant also differs based on his or her age. In this context, age and learning capacity are both measurable traits that are likely to differ from one time to another. Therefore, age and learning capacity are examples of __________.


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