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.
Binary tree, a conceptual metaphor (and a data structure) for sequences of bits. Binary data is data whose unit can take on only two possible states, traditionally termed 0 and +1 in accordance with the binary numeral system and Boolean algebra.Forms and interpretations of binary data come in different technical and scientific fields.lthough the binary numeral system is usually cited as the main reason of this, many (if not most) data in modern computers are not numbers. Then, binary data can refer to any data represented directly in binary form rather than interpreted on a higher level or converted into some other form.