Types of graphs — part two
1-Frequency polygons
Looks like a line graph. You make a dot for each observation. Class midpoint on x-axis and frequency on y-axis. Drawn over a histogram. The midpoint of a bin is calculated by adding the upper and lower boundary values of the bin and dividing the sum by 2.
2-Ogive
Looks like a line graph. Class boundaries are on x-axis and commutative frequency is on y-axis.
step 1 = 20 to 21 the midpoint is 20.5 then we know now the value is 0.5. Step 2 = 11–0.5, 21 -0.5, 31–0.5 , 41–0.5 the results are the lower class boun. Step 3 = 20+0.5, 30+0.5, 40+0.5, 50+0.5 the results are the upper Class b. Step4 = 23, 23+43, 23+43+51, 23+43+51+27 are Commutative Frequen . Step5 = Y-axis and x-axis you start with (10.5–0) then continue.
3-Dotplot
dotplot is made up of dots plotted on a graph. It is used for explaining data trends or groupings.
4-Pie Chart/Circle chart
It is used to compare parts to a whole.
5-Histogram
Observations values on x-axis. Frequency or Relative frequencies on y-axis. A bar for each observed value is constructed.
6-Stem and Leaf
Used to display data consisting of two digits numbers. Tens columns on the left side as stem. On the right side the corresponding ten(leaves).
7-Pareto chart
Contains both bars and a line graph.
Please add your comments or send an email to the author at yamors01@louisville.edu. See you next lesson.
