First I'd like to thank you for your effort in making this tutorial. The thing is that I found a mistake ( which I didn't know where to report ) in "Rules From the Tree" section where the second, third, and fourth rules are wrong, and they should be as follows:

# (District=Suburban) AND (House Type=Semi-Detached) => (Outcome = Responded)

# (District=Suburban) AND (House Type=Terrace) AND (Income=High) => (Outcome = Nothing)

# (District=Suburban) AND (House Type=Terrace) AND (Income=Low) => (Outcome = Responded)

Thanks