A bar chart uses bars to show comparisons between categories of data. These bars can be displayed horizontally or vertically.
Histogram
It provides a visual interpretation of numerical data by showing the number of data points that fall within a specified range of values (called “bins”).
Histogram Line Chart
A frequency polygon is a graph constructed by using lines to join the midpoints of each interval, or bin
Scatter Plot
This diagram is used to find the correlation between these two variables, how they are related.
Chart1- Scatter Diagram with Strong Negative Correlation
Chart2- Scatter Diagram with Weak Negative Correlation
Chart3- Scatter Diagram with Strong Positive Correlation
Chart4- Scatter Diagram with Weak Positive Correlation
Chart5- Scatter Diagram with Weakest (or no) Correlation
A heat map is a graphical representation where individual values of a matrix are represented as colors. A heat map is very useful in visualizing the concentration of values between two dimensions of a matrix. This helps in finding patterns and gives a perspective of depth.
To better understand the table above, a heat map is more useful:
Recap
Below flow chart is very handy when choosing the best chart type to use.
These are the chart types we'll cover here. Of course, there are many more.
Common Functions Reference
Linear Functions
linear function
m = (change in y) / (change in x) -----> Slope or Gradient (how steep the line is)
b = value of y when x=0 ----> just to see where the line crosses the Y axis.
positive - negative slope
Linear Function Example
positive slope
negative slope
Parabolic Functions
b is easy: just see where the line crosses the Y axis.
parabolic function
Cube Functions
Square Root Functions
How Polynomials Behave
A polynomial looks like this:
Even values of "n"
Odd values of "n"
Examples
correct answer: B
correct answer: A
Exercises
1- What is "Numerical Reasoning Test"? Where is it used?
