Transcript Document

20S Applied Math
Mr. Knight – Killarney School
Unit: Real Number System
Lesson: LMP-L3 Creating Lines of Best Fit using Winstats
Lines of Best Fit Using
Winstats
LMP-L3 Objectives:
To use Winstats to create lines of best fit.
Learning Outcome B-4
Slide 1
20S Applied Math
Mr. Knight – Killarney School
Unit: Real Number System
Lesson: LMP-L3 Creating Lines of Best Fit using Winstats
The following data describes the number of bacteria present at
amounts of time following an antibacterial spray being applied.
Winstat can simplify the process of
making a scatterplot and finding a
line of best fit.
Open Winstats
Click on Window > Multi-Var Data
In the new window go Edit > Dimensions
Key in 7 and 2 as the number of rows and columns
Objectives
Slide 2
20S Applied Math
Mr. Knight – Killarney School
Unit: Real Number System
Lesson: LMP-L3 Creating Lines of Best Fit using Winstats
Click on Data (in red) in the first column
and change the text to Hours. Press Enter
to accept the entry.
Similarly click on Data in the second column and
change the text to Bacteria. Press Enter.
Enter the data. (If you right-click on a data cell, then
each time you hit enter you go to the next cell. If you
only left-click, hitting enter exits the data-entry
process.)
Go Edit > Format. Change decimal place to 2.
Click on View and then on Set corners… and
change the extremes to the values shown on the
right.
Example 1 – Slope review
Slide 3
20S Applied Math
Mr. Knight – Killarney School
Unit: Real Number System
Lesson: LMP-L3 Creating Lines of Best Fit using Winstats
Go Plot > 2D Plot A
In the new window, go Line >
Least-Sq to get a line of best fit to
show.
Mess with View > Overlay Axes,
View > Corners and View > Grid to
make the scatterplot look like the
one at right.
Notice the Equation, in the form
y=mx+b. We can use this derived
equation to analyze this situation
further if we wish.
Example 2 – Slope review
Slide 4