Chap 2

Question 1

What is data science

Answer 1

its a multi disciplinary field that uses scientific methods , processes , algorithms and systems to extract knowledge and insights from structured , semi-structured and unstructured data.

Question 2

what is a data scientist ?

Answer 2

its a person engaging in a systematic activity to acquire knowledge from data.

Question 3

what is the role of data scientists ?

Answer 3

they perform research toward a more comprehensive understanding of products , systems or nature including physical , mathematical and social realms

Question 4

what are the skillset of data scientists?

Answer 4

a strong background in
1. statistics and linear algebra
2. programming knowledge
3. data warehousing , mining and modeling to build and analyze algorithms.

Question 5

what is an algorithm ?

Answer 5

its a set of instructions designed to perform a specific task.

Question 6

what is Data?

Answer 6

Data can be described as unprocessed facts and figures, it can exist in any form.

Question 7

what is information ?

Answer 7

its data that has been given meaning and is the processed data on which decisions and actions are based.

Question 8

what is Data processing

Answer 8

its the restructuring of data by people or machines to increase their usefulness and add value for a particular purpose.

Question 9

what are the basic steps of data processing ?

Answer 9

• input
  -processing
  -output

Question 10

what are some material forms of data?

Answer 10

numbers
text
symbols
images
sound

Question 11

what are the 2 categories of data forms

Answer 11

qualitative =descriptions
quantitative =numeric records

Question 12

what’s data type

Answer 12

its what informs the interpreter how the programmer intends to use the data

Question 13

what are the different types of computer programming perspectives

Answer 13

• integers
  -booleans
  characters
  strings
  float
  Astrings

Question 14

what are the 3 common types of data types:

Answer 14

structured
semi structured
unstructured

Question 15

what is structured data

Answer 15

its data that can be easily organized stored and transferred in a defined data model

Question 16

what is semi structured data

Answer 16

its a mix of unstructured and structured data

Question 17

what is unstructured data

Answer 17

information that either does not have predefined data model or is not organized in a pre defined manner

Question 18

what is meta data?

Answer 18

its data about data.
It provides additional information about a specific set of data

Question 19

what is Data value chain?

Answer 19

it describes the process of data creation and reuse

Question 20

whats data acquisition :

Answer 20

its the process of gathering filtering and cleaning data

Question 21

what is data analysis?

Answer 21

its the process of evaluating data using analytical and statistical tools to discover useful information
it involves :
exploring
transforming
modeling data

Question 22

what is data curation?

Answer 22

its the active management of data over its life cycle to ensure that it meets the necessary data quality requirements for its effective usage.

Question 23

what are the different activities of data curation processes ?

Answer 23

content creation
selection
classification
transformation
validation
preservation

Question 24

what is data storage

Answer 24

its the persistence and management of data

Question 25

what is data usage

Answer 25

it is the use of data for the required purpose

Question 26

what is big data

Answer 26

its a collection of data sets that are large and complex, and that is hard to process using management tools or data processing apps

Question 27

what 3 things is the definition of big data based on?

Answer 27

volume
velocity
variety

Question 28

what is resource pooling ?

Answer 28

combining the available storage space to hold data

Question 29

whats High availability

Answer 29

it prevents hardware or software failures from affecting access to data and processing

Question 30

whats easy scalability

Answer 30

it makes it easy to scale horizontally by adding additional machines to the group

Question 31

whats hadoop

Answer 31

its an open software that stores and processes large non-relational data

Question 32

what are the 4 characteristics of hadoop?

Answer 32

1. economical
   2.reliable
   3.scalable
   4.flexible