Data Exploration Phase | CBSE Class 10 AI Project Cycle Notes – 4
1. What is data exploration?
It is the process to the clean the data by removing duplicate or unrequired data, handling missing values and understanding the nature of data.
2. What are the techniques used in data exploration phase?
i. Data Cleaning – Removing duplicate or unrequired data
ii. Handling missing data
iii. Data Visualization
3. What is the need of data exploration?
i. To explore and identify relationship between different variables.
ii. To understand the structure of the dataset.
iii. To find trends and patterns in data.
4. What do you mean by data visualization?
It is the process to represent data visually by using charts, graphs, diagrams and maps etc.
5. List some data visualization techniques.
i. Charts: They use an established pattern for displaying data.
ii. Graphs: They contain X and Y axis with at least one showing numerical data.
iii. Maps: They are used for visualizing geographical data.
iv. Temporal: They are used to display data over a period of time.
v. Network: They are used to display how data is related within a network.
vi. Infographics: They are used to display textual data in a pleasing way.
6. Write names of some data visualization softwares:
i. MS Excel
ii. Google Charts
iii. Tableau
iv. Data Wrapper
v. Infogram
vi. IBM Watson
7. What is the need/importance of data visualization?
i. It can represent data in visual form.
ii. It becomes easy to interpret the data.
iii. It becomes easier to see trends and relationship among data.
iv. It can be used to explore data with presentable results.
8. Mention some popular data visualization techniques.
i. Bubble chart
ii. Scatter graph
iii. Line chart
iv. Bar graph
v. Histogram
vi. Pie chart
vii. Choropleth
viii. Heat map
ix. Timeline
x. Nodel link diagram
xi. Word cloud
9. What do you mean by XY (Scatter) Chart?
XY (Scatter) chart is used to display relationship between numerical values in multiple data series using X and Y coordinates.
10. What do you mean by Bubble Chart?
Bubble chart is used to display relationship between numerical variables with marker size. They are shown by drawing bubbles using X and Y coordinates. Bigger marker (bubble) means bigger value.
11. What do you mean by Line Chart?
It is used to display trends in data at equal intervals. They are useful for viewing the change in a value over a period of time.
12. What do you mean by Pie Chart?
Pie chart is used to represent a single data series in the form of a circle. Each data value is calculated as a percentage of the whole and represented as a pie. For example, voting data can represented using pie chart.
13. What do you mean by bar Chart?
Bar chart is used to display comparison among numerical variables by drawing bars. They are shown by drawing bars using X and Y coordinates.
14. What do you mean by histogram?
Histogram is used to summarize numeric data by displaying data points within a specific range of values called bins. They are drawn using X and Y coordinates.
15. What do you mean by Choropleth maps?
Choropleth maps are used with statistical data along with text data like countries, states to display data related to geographical regions.
16. What do you mean by Heat map?
Heat map is the graphic representation of data in which values are represented by colours. For example, it can be used to display population density in a map using different colours.
17. What do you mean by Timeline Chart?
Timeline Chart is used to display a series of events in chronological order i.e. they can be used to display historical events and other activities according to their dates.
18. What do you mean by Node Link Diagram?
Node Link Diagram is used to display multiple things interconnected through use of nodes(vertices) and link lines to represent relationship between them.
19. What do you mean by Word cloud?
This is the method to represent frequency of a word within a block of text with its relative size in the entire text. This technique can be used to display words having high frequency or low frequency.
20. Name some data visualization techniques used for representing statistical data.
Choropleth maps
21 Name some data visualization techniques used for representing numerical data.
XY (Scatter) Chart, Bubble Chart, Bar Chart, Histogram
22. Name some data visualization techniques used for representing textual data.
Word Cloud
23. Name some data visualization techniques used for representing relationships of data among a network.
Node Link diagram
24. Name a data visualization technique used for:
a. Textual Data – Word Cloud
b. Numeric Data – XY (Scatter) Chart
c. Statistical Data – Choropleth map