Big idea 2: Data

Question 1

bit

Answer 1

A binary digit, either 0 or 1.

Question 2

roundoff

Answer 2

Error that results when the number of bits is not enough to represent the number with full precision (like using 3 digits to represent π pi as 3.14).

Question 3

analog data

Answer 3

Values that change smoothly, rather than in discrete intervals, over time. For example, the pitch and volume of a live concert.

Question 4

lossless

Answer 4

Compressing data in a way that preserves all data away and allows full recovery of the original.

Question 5

lossy

Answer 5

Compressing data in a way that discards some data and makes it impossible to recover the original.

Question 6

metadata

Answer 6

Data about data, like descriptive information about a file or a row in a database.