Chapter 1

Question 1

Quality of info

Answer 1

1) Accuracy
2) Age
3) Relevance
4) Level of detail
5) Completeness

Question 2

ADVANTAGES of coding

Answer 2

• speed of input
• less storage
• presentation
• processing
• validation
• security
• consistency

Question 3

DISADVANTAGES of coding

Answer 3

• interpretation
• not enough code names
• similarity
• omission

Question 4

What is data?

Answer 4

Raw facts and figures with no meaning

Question 5

What is information?

Answer 5

Data with meaning

Question 6

Name 3 data types

Answer 6

Numeric, Date/Time and character/string

Question 7

What is the smallest element of an image that can be edited ?

Answer 7

a pixel (picture element)

Question 8

What is a bitmap graphic ?

Answer 8

Store details about every individual pixel that makes up an image

Question 9

What is a vector graphic ?

Answer 9

Stores components of the image as mathematical equations.

Question 10

What is streaming ?

Answer 10

Process that allows video to be viewed straight away without having to wait for the full video to be downloaded

Question 11

What is a buffer ?

Answer 11

Computer memory used to store a part of the video before it is watched

Question 12

What does buffering help to do ?

Answer 12

Helps to prevent possible disruptions if there are time delays in streaming while the video is playing

Question 13

What is the sample rate ?

Answer 13

number of audio sound samples captured per second

Question 14

What is bit depth ?

Answer 14

The number of bits used for each sound sample

Question 15

What is bit rate ?

Answer 15

The quantity of data measured in bits that is processed in a given amount of time

Question 16

How is a sound sample converted from analogue to digital ?

Answer 16

• An ADC will will sample the signal at regular intervals

- samples are the converted to digital format

Question 17

What is Static Data

Answer 17

data that is either fixed or has to be changed manually by editing a document

Question 18

What is dynamic data

Answer 18

data that is updated automatically without user intervention

Question 19

indirect data source

Answer 19

a secondary source that already existed for another purpose

Question 20

direct data source

Answer 20

a primary source whos data must be used for the same purpose for which it was collected

Question 21

ADVANTAGES & DISADVANTAGES OF Direct Data Source

Answer 21

data will be relevant
original source is known and trusted
it can take a long time to gather original data
a large sample of statistical data can be difficult to collect for one-off purposes
data is likely to be up to date because it has been collected recently
Bias can be eliminated by asking specific questions
data can be collected and presented in the format required

Question 22

ADVANTAGES & DISADVANTAGES OF Indirect Data Source

Answer 22

additional data that is not required will exist that may take time to sort through
the original source may not be know and so it ca not be assumed that it is reliable
the data is immediately available
if statistical analysis is required, then there are more likely to be large samples available
data may be out of date because it was collected at a different time
original data may be biased to to its source
data is unlikely to be in the format required

Question 23

Quality of Information is determined by 5 attributes - name them

Answer 23

ACCURACY
RELEVANCE
AGE
COMPLETENESS
LEVEL OF DETAIL

Question 24

ENCODING vs ENCRYPTION

Answer 24

ENCODED data is stored in a specific format - binary digits (0, 1)
ENCRYPTED data is scrambled so it can not be understood

Question 25

Symmetric Encryption

Answer 25

oldest method

requires both the sender and recipient to possess the secret encryption and decryption key

Question 26

Asymmetric encryption

Answer 26

known as public-key cryptography
a public key available to anyone
a private key known only to recipient
the key is the algorithm required to encrypt and decrypt the data