The null hypothesis of an analysis of variance is that the __________ means are equal

According to the introduction to the section on problem understanding,

a. understanding occurs when we have evolved an external representation for an internal problem. b. a primary criterion for understanding is the ability to represent the problem in matrix form. c. attention is necessary for problem solution, but it is not essential for problem understanding. d. understanding requires a close correspondence between the situation you need to understand and your own internal representation.

The primary concern of developmental scientists is to explore the processes of development ("how"), rather than the reasons behind these processes ("why")

Indicate whether this statement is true or false.