APCSP Big Idea #2

Data

collection of numbers and facts from different sources

Bits

are what computers store data in

8 Bits

1 Byte

Hexadecimal

RGB color codes & it uses numbers & letters to represent values

ASCII Code

converts text to binary format (“A” dec: 65, hex: 41, every letter is +1 after)

Abstraction

reduces complexity by only focusing on the most important parts & hiding the irrelevant parts from the user.

Analog Data

measured continuously & change smoothly

Digital Data

measured digitally and leaves out extra data by simplifying the data collected (form of abstraction)

Data Compression

dependent on 1) the method used and 2) the amount of repeated info in the data

Lossless Compression

less compression & better file quality

Lossy Compression

more compression & worse file quality

Metadata

data about data

Data Mining

examining very large data sets to find information

Transforming Data

editing or modifying data