1. *Bring Money for Yearbook!
Using Excell
*Bring Money for Yearbook!

2. Computer Software
There are two statistical software packages that are often used
Minitab
JMP
Once you understand the statistical ideas, you can read and work with almost any software output.

3. DATA Analysis (school computers)
Go to File
Down to “Options”
Click on “Add ins”
Mark the first 2 – Data Pak
Click on “Go”
It will now be found under Data in the Data Analysis section.

4. DATA Analysis (Windows 97)
Go to Tools
Click on “Add ins”
Check 1st 2
It will now be found under Tools

5. DATA Analysis (Vista) Go to Tools Click on “Add ins” Check 1st 2
It will now be found under Tools

6. Put independent variable in column A.
A study of nutrition in developing countries collected data from the Egyptian village of Nahya. Here are the mean weights (in kg) for 170 infants in Nahya who were weighed each month during their first year of life:
Age (mths)
Weight (kg) 1
4.3 2
5.1 3
5.7 4
6.3 5
6.8 6
7.1 7
7.2 8 9 10 11
7.5 12
7.8
Put independent variable in column A.
Put dependent variable in column B.
Go to Data Analysis – to Regression
Hightlight B column for y-range.
Hightlight A column for x-range
Click on labels (if you included them)
Click on output – click space to put it
If you want the normal probability plot, click on it.
Try it: Computer Printout Example.xlsx

7. Regression Statistics
What you get!
SUMMARY OUTPUT
Regression Statistics
Multiple R
R Square
Adjusted R Square
Standard Error
Observations 12
= r
= n

8. Ignore this part of the print out for now…you’ll get it later in the spring!
ANOVA df SS MS F
Significance F
Regression 1
4.79E-05
Residual 10
Total 11

9. The y – intercept (a) The slope (b) The x-variable Coefficients
Coefficients
Standard Error
t Stat
P-value
Lower 95%
Upper 95%
Intercept
1.13E-08
Age (mths)
4.79E-05
The y – intercept (a)
The slope (b)
The x-variable

10. Scatter plot with regression line: (for school computers)
Highlight all of the data, including labels
Click on Insert
Click on Scatter
Click on top left graph
To get the regression line you right click on one of the points and choose trendline and click enter.

11. Scatter plot with regression line: (for windows 97)
Click on Chart wizard
Scatter(xy)
1st one click Next
Highlight Data Range (do not include labels) & press next
Type in labels for x & y
Press Next & Finish
To get line – click on point & press add trendline

12. Normal Probability Plots
Used to determine if the data is approximately normal
If it appears to be a straight line – then it’s approximately normal

13. Find equation for the data below comparing the intensity of a baby’s cry & their IQ.
ANOVA df SS MS F
Significance F
Regression 1
Residual 8
Total 9
4037.6
Coefficients
Standard Error
t Stat
P-value
Lower 95%
Upper 95%
Intercept
7.68E-05
Crying

14. Residual Plot
Looking for no – pattern in order for it to be a good linear model
Click on residual plot when doing the regression to see it.

15. Homework
Worksheet