1. Microsoft Excel Chapters 6&7
Nagendra Vemulapalli

2. Announcements Lesson B in MyITLab is due today (09/17/2012) by 11:59pm
Homework Assignment2 is due on 09/21/2012 by 11:59pm
Homework Assignment3 is due on 09/28/2012 by 11:59pm

3. Trend lines
A trend line is Excel’s best guess at a mathematical equation to represent the given data
We can then use that equation to predict the future.
The possible types of trend lines are:
Exponential
Linear
Log
Polynomial
Power
12/9/2018
Nagendra Vemulapalli

4. Adding the Trend Lines
Select the series you want to add the trend line to.
Right click and choose Add Trend line
Select the Trend line that “Best Fits” the Data points
Turn on “Display R-squared value on chart”
R-squared value: “Close to 1.0” means better approximation
Note that the R-squared value does not always give you the best result. Think in all perspectives
12/9/2018
Nagendra Vemulapalli

5. Alligator Example Download example1 file We will add a Trend line
“Line of Best Fit” will be identified for a scattered plot:
We will fit a line on the data points and figure out which type of line will be the best model for the data
Exponential
Linear
Log
Polynomial
Power
12/9/2018
Nagendra Vemulapalli

6. Alligator Example Cont’d – Scatter Chart
Select the range A5:B29
Creating the scatter chart:
Insert ribbon
Scatter
12/9/2018
Nagendra Vemulapalli

7. Scatter Chart Labeling the chart Design tab
Chart Layouts drop down menu
Select the first one that has labels for the title, x-axis, and y-axis
Type the following:
Chart Title: Alligator Regression
X Axis Title  Length in Inches
Y Axis Title  Weight in Pounds
12/9/2018
Nagendra Vemulapalli

8. Adding a Trendline Cont’d
Remember that we want to examine the line that best fits our points
Exponential
Fits nicely around the data points
Exponential Curve that touches all of them and follows the direction of points
Nagendra Vemulapalli
12/9/2018Date

9. Adding a Trendline Cont’d
Linear
A straight line
Goes in the same direction but does not touch most of the points!
Therefore, it’s probably not the best one to use as our model
Nagendra Vemulapalli
12/9/2018

10. Adding a Trendline Cont’d
Logarithmic
It does not seem to model our scattered data points accurately
Nagendra Vemulapalli
12/9/2018

11. Adding a Trendline Cont’d
Polynomial
Most of the points are touched
Moving in the same direction of the data
Similar to the exponential
Nagendra Vemulapalli
12/9/2018

12. Adding a Trendline Cont’d
Power
Moves in the same direction of the data, but doesn’t touch most of the points
Nagendra Vemulapalli
12/9/2018

13. Adding a Trendline Cont’d
Narrow and compare our options
Exponential “looks” better choice but wait try increasing order of polynomial to 3!
Exponential vs Polynomial
Nagendra Vemulapalli
12/9/2018

14. Predicting Predicting graphically Predict Numerically Compare Results
Forecast forward
Predict Numerically
Display equation
Increase precision
Reformat Equation
Insert into dataset
Compare Results

15. Predicting Graphically
Click on your Trendline to highlight it
Right click
Select “Format Trendline…”

16. Forecasting forward

17. Forecasting forward Enter 3.0 Close
Chart is extended to almost 150 inches and almost 700 pounds (visually)

18. Predicting Numerically
More exact numbers to base our future estimates on
Displaying an equation on the chart
Right click on the Trendline
Select “Format Trendline…”

19. Predicting Numerically
Check the box to the left of “Display Equation on chart”
The equation will be displayed on your chart
Increasing precision
Right click on the equation
“Format Trendline Label…”
“Number”
Decimal Places: 4
Close
Precision has increasing

20. Reformatting equation
Now we know the equation of the curve
y = x x x
Let’s convert this into a formula in Excel.
In cell B30, enter
=0.0008*A30^ *A30^ *A
Note that ‘*’ is a multiplication and ‘^’ is a power.
Autofill B31 and B32 and you can predict the unknown values.

21. Sorting
Excel allows you to sort a spreadsheet by alphabetical or numerical or chronological order.
The order Can be either Ascending or Descending

22. Sorting Example Download the example2 file from Today lecture notes
Select A2:D10
Data ribbon -> Sort & Filter group -> Sort button
To sort ascending on last name, choose
Sort by “Last”

23. Sorting Example Continued
Multiple sorting can be done based on other additional criteria as well.
Select A2:D10
Sort button from Data ribbon
Click Add Level button
To do the additional ascending sort “First Name” choose Then by “First”

24. =AVERAGE(’Employee Info’!D2:D10)
Sheet References
You can reference data from another sheet just like you can reference data from your current sheet.
Flip to the Salary Stats sheet in Example2 file
In cell B1 type
=AVERAGE(
For entering the Range Switch to the Employee Info sheet and select D2:D10 and hit enter while you are on the same sheet
Then cell B1 in Salary Stats sheet should become
=AVERAGE(’Employee Info’!D2:D10)
Repeat the same process for Total Salaries

25. Sheet Referencing..
Calculate the salary Ratio of the Employee in 3rd row to Employee in the 2nd row.
It should look like
='Employee Info'!D3/'Employee Info'!D2

26. Freezing/Unfreezing Top Row
Freezing can keep part of a sheet in place while allowing another to scroll.
To Freeze the top row:
View ribbon -> Window group -> Freeze Panes -> Freeze Top Row
Scroll down and observe!
To Unfreeze:
View ribbon -> Window group -> Freeze Panes -> Unfreeze

27. Hide/Unhide cells To hide Rows 2 to4 To unhide rows 2 to 4
In Employee Info sheet, select rows from 2 to 4
Right Click -> Select Hide
To unhide rows 2 to 4
Select Row 1 and Row 5
Right Click -> Select Unhide
You can apply the same technique to columns

28. Locking /Unlocking a worksheet
If a worksheet is “protected” , meaning that the locking property is on, then all cells are locked and no data can be entered.
Locking a worksheet
Home ribbon -> Cells group -> Format Cells -> Protect sheet…
Enter a password (twice)
Click OK
Unlocking
Home ribbon -> Cells group -> Format Cells -> Unprotect sheet…