Aresearcher finds individuals who report large numbers of life changes in their lives usually also report higher levels of stress. those who report fewer life changes generally report lower levels of stress. the correlation between number of life changes and stress level is:

What was piaget's explanation as to why preschool-age children in the preoperational stage make errors on tasks requiring conservation? a) preschool children's tendency toward centration prevents them from focusing on other relevant features of a situation b) preschool children have not yet developed numerical understanding; therefore, different amounts are meaningless c) preschool children's neural-visual network is not fully matured d) preschool children have not lived long enough and accrued enough experience to know the difference between quantities