You are interested in seeing how self-control develops as children go from early childhood to middle childhood. You test children at three years of age and then again at five years of age and then again at seven years of age to see if there are changes in their level of self-control. Your colleague has done a similar study but decided to test all the children at one point in time. Your study would be considered ______ whereas your colleague's study would be considered ______.
O cross sectional; sequential (cross sequential)
O cross sectional; longitudinal
O longitudinal; cross sectional
O sequential (cross sequential); cross sectional