1. What percentage of households in the study were owners of a riding
mower?
16.6%
2. Create a scatterplot of Income versus Lot Size using color or symbol to differentiate owners from
nonowners. From the scatterplot, which class seems to have the higher average income, owners
or nonowners?
120
100
80
Riding
60
Non Riding
40
20
0
0
2
4
6
8
10
12
14
Owners tend to have the higher average income.
3. Among nonowners, what is the percentage of households classified correctly?
4. To increase the percentage of correctly classified nonowners, should the cutoff probability be
increased or decreased?
5. Create the lift chart and decile chart for the training data set.
6. What is the classification of a household with a $60K income and a lot size of 20(000) ft2? Use
cutoff = 0.5.