Week 2

Question 1

Users have become content providers, what is crowdsourcing?

Answer 1

Outsourcing the task to the whole population, use the power of the population

Question 2

Big data according to ZIKOPOULOS (2)

Answer 2

1. Information that can’t be processed or analysed using traditional processes or tools”.
2. Data in its most raw form or in a semi-structured or unstructured format.

Question 3

Characteristics of Big Data (4)

Answer 3

1. Volume (large amounts)
2. Variety (different kinds of data - images, text)
3. Velocity (rate of change - real time)
4. Veracity (how reliable/correct)

Question 4

Business Intelligence (BI) (3)

Answer 4

1. The applications, infrastructure, tools and best practices
2. That enable access to and analysis of information
3. To improve and optimise decisions and performance

Question 5

Formula for ‘P’recision:

Answer 5

true positives / all positive ‘P’redictions (true positive + false positive)

Question 6

Formula for ‘R’ecall

Answer 6

true positives / all positive cases in ‘R’eality (true positive + false negative)

Question 7

BI systems architecture consists of? (3)

Answer 7

1. Data Store
2. Data Warehouse
3. Data Mart

Question 8

What are the three human roles in BI Data Management?

Answer 8

• Data Owner: Accountable for data’s fitness
• Data Steward: Responsible for managing data output
• Data User: uses the data for applications

Question 9

Tableau software is an example of a …. tool

Answer 9

Business Intelligence tool