Correlation and Regression in Excel
1. Enter the following data into Excel (this is real data, from First-Year college students who
rated their roommates at the start and end of the school year)
Conscientiousness
time 1
5
5
5
5
2
4
6
5
2
5
2
2
7
5
3
7
5
4
6
4
7
6
6
5
1
6
Conscientiousness
time 2
6
5
5
3
1
2
5
7
1
4
2
1
1
1
5
1
2
4
6
5
2
6
2
3
3
5
2. Get Excel to draw a scatterplot of this data. (Use the “Insert->Chart” menu). Sketch it
below. Estimate the correlation, regression intercept and regression slope based on this
picture.
3. Calculate the correlation. r = ________
4. Calculate the regression slope and intercept. Write the equation here: Y’ = ____ + ____ X
5. Copy the original data into a new worksheet. Using your regression equation, get a column
of predicted values and a column of residuals. Create a scatterplot, plotting the residuals on
the Y axis and the time 1 scores on the X axis. Sketch it below.
6. Fill in the regression ANOVA table below, based on calculations you do on the predicted
values and residuals:
Source
SS
df
s2
F
Model
Error
Total
7. Copy the original data into a new worksheet. Have Excel do a full regression analysis on it.
Go “Data Analysis-> Regression. Input the X range and Y range. Check off the box that says
“residual plot”. Do the answers match yours above?