You can choose from in-person surveys (one-on-one interviews carried out at high-traffic locations), telephone surveys (less expensive than one-to-one interviews), mail surveys (easy to reach a large audience) and online surveys (simple and inexpensive way to collect data, though not reliable).
A binary tree of depth d is an almost complete binary tree if: 1  Each leaf in the tree is either at level d or at level d â 1. 2  For any node nd in the tree with a right descendant at level d, all the left descendants of nd that are leaves are also at level d.
Identify Trees With Leaves. If you are confused with some of the terms used here, please use my definitions of terms used for tree identification. Several Common Terms for this Major Tree Category. 1  HARDWOOD-Trees with broad, flat leaves as opposed to coniferous or needled trees.