Unit 2

Question 1

What is a byte?

Answer 1

A unit of data that is 8 bits long. It is considered a standard “chunk size” for binary information in most modern computers.

Question 2

What is a kilobyte?

Answer 2

A unit of data made up of 1024 bytes

Question 3

What is a megabyte?

Answer 3

A unit of data made up of 1024 kilobytes

Question 4

What is a gigabyte?

Answer 4

A unit of data made up of 1024 megabytes

Question 5

What is a terabyte?

Answer 5

A unit of data made up of 1024 gigabytes

Question 6

What is a petabyte?

Answer 6

A unit of data made up of 1024 terabytes

Question 7

What is an exabyte?

Answer 7

A unit of data made up of 1024 petabytes

Question 8

What is a zetabyte?

Answer 8

A unit of data made up of 1024 exabytes

Question 9

What is the SI Prefix Value Table?

Answer 9

Exa-E-10^18

Peta-P-10^15

Tera-T-10^12

Giga-G-10^9

Mega-M-10^6

kilo-k-10^3

Question 10

How much bigger is a megabyte than a kilobyte?

Answer 10

1000 times bigger

Question 11

What is heuristic?

Answer 11

A problem-solving approach (algorithm) to find a satisfactory solution where finding an optimal or exact solution is impractical or impossible.

Question 12

Which one is heuristic?

Piecewise vs. holistic

Answer 12

Holistic

Question 13

Which one is heuristic?

Inductive vs. deductive

Answer 13

Deductive

Question 14

What is a pixel?

Answer 14

A picture element, of a fundamental of a digital image. It is typically a tiny square or dot which contains a single point of color of a larger image

Question 15

What is a Image?

Answer 15

A type of data used for graphics or pictures

Question 16

What is metadata?

Answer 16

Data that describes other data

Size of the image, number of colors, resolution

Question 17

What is RGB?

Answer 17

This model uses varying intensities of Red, Green, Blue light that are added in together to create a broad array of colors

Question 18

36 bit color can represent ____________ times the total number of colors that 24 bits can represent

Answer 18

2^12

Question 19

What shows the hex value for Red as a 12 bit representation?

Answer 19

F00

Question 20

What is Lossless Compression?

Answer 20

A data compression algorithm that allows the original data to be perfectly reconstructed from the compressed data

Question 21

What is Lossy Compression?

Answer 21

Compression scheme in which “useless” or less than totally necessary information is thrown out in order to reduce the size of the data (eliminated data is unrecoverable)

Question 22

What types of files are lossy?

Answer 22

MP3, JPG, JPEG

Question 23

What types of files are lossless?

Answer 23

BMP, GIF, WAV, PNG, ZIP

Question 24

What is true about data compression?

Answer 24

There are trade-offs involved in choosing a compression technique for storing and transmitting data

Question 25

What best describes the result of using 64 bit integers instead of 32 bit integers?

Answer 25

2^32 times as many values can be represented

Question 26

What is the Hexadecimal Number System?

Answer 26

A numbering system that consists of 16 distinct symbols, 0-9 and A-F, which can occur in each place value

Question 27

What is a hypothesis?

Answer 27

A proposed explanation for some phenomenon used as the basis for further investigation

Question 28

What us README?

Answer 28

A document providing background information about a data set

Question 29

What is CSV?

Answer 29

(Comma Separated Values), widely used file format for storing data

Question 30

What is Raw Data?

Answer 30

Original data as it was collected

Question 31

What is a summary table?

Answer 31

Table of aggregate information about a data set. Used to summarize lots of data into a form that is more useful and easier to see

Question 32

What is a pivot table?

Answer 32

Tool used by most spreadsheet programs to create a summary table

Question 33

What is aggregation?

Answer 33

A computation in which rows from a data set are grouped together and used to compute a single value of more significant meaning or measurement. Common aggregations include sum, average, max, median, or count

Question 34

Search trends are imperfect predictors of the future and may not fully represent society at large, true or false?

Answer 34

True, they may not fully represent society at large

Question 35

Search trends are accurate and reliable predictors of future events, but do not fully represent society at large, true or false?

Answer 35

Depends

Question 36

What is least likely to impact a programmer's choice when designing a structure of a system?

Answer 36

Either the frequency of a particular item occurring in a data set, or the accuracy of the data after being stored

Question 37

Rate from most important to least important for what a programmer needs when designing the structure of the system?

Answer 37

1. Maintaining Privacy 2. Structure of the metadata for analysis 3. Scalability of the system 4. Frequency of a particular data value 5. Accuracy of the data after being stored