Storage
What is a bit?
building block of storage (0/1)
Why is compression helpful?
Reduce bandwidth and save disc space (make it smaller without losing important info)
What are large data sets called?
big data
What does a bar chart do?
shows data using horizontal and vertical bars
reduces complexity by only focusing on the most important parts & hiding the irrelevant parts from the user
How many bits make a byte?
8
What is lossless compression?
reduce file size without losing any information
What are outliers?
data points that do not fit with the typical trend of the data set
What do scatterplots help determine?
Correlation
Transforming Data
editing or modifying data (ex: doubling every number/graphing data points)
What is analog data?
measured continuously (volume of music)
What is lossy compression?
data about data (does not affect the data)
What does a correlation coefficient of r=-.2 signify?
a weak negative correlation
Cleaning Data
making data uniform w/o changing meaning (ex: correcting misspelled words)
What is digital data?
finite set of possibilities
What is run-length encoding?
replacing a long string of the same value with the value and the number of times it appears
What is data mining?
the process of going through big data to find useful information and patterns
What do histograms usually represent?
frequencies and ranges
Hexadecimal
used for RGB color codes & it uses Base 16 Conversion Charts: Binary and Hexadecimal
using zeroes and ones where 2^x is to represent numbers
No
What 4 challenges does data pose?
you have to clean it, there can be incomplete data, there can be invalid data, and you have to combine different data sources
What does correlation not show?
ASCII Code
converts text to binary format