Test 1

Question 1

Explain big data

Answer 1

Big data refers to massive and complex dataset that are hard to process

Question 2

What are key characteristics is big data and example

(4 petabytes)

Answer 2

Big data key characteristics are

Volume: the large size of data

Velocity: the speed at which data is generated

Variety: different type of data

For example: Facebook generated over 4 petabytes of data daily

Question 3

The role of visualisation plays in big data and example

(Hint: graphs)

Answer 3

Visualisation help make big data understandable by turning raw data into charts graphs and dashboards

For example in healthcare, visualisation patient record, device data can reveal health trends.

Question 4

Explain the concept of data accuracy, data validity and data reliability

Answer 4

Data accuracy: ensure that data is correctly represented and recorded and must match correctly

Validly: ensure data measure what it supposed to do

Reliability: ensure data is consistent over time and methods