1. A learner investigates three types of roofing materials: galvanised iron roofing with a ceiling,
thatched roofing and galvanised iron roofing.
The learner used cardboard to make three
model houses of the same size. He put a
thermometer in each of the models and put
all three model houses outside in the sun. He
measured and recorded the temperature in each
model house every 5 minutes for 30 minutes.
a) State a possible hypothesis for this
investigation.
b) Why did the learner make the model
houses all the same size?
c) State the independent, dependent and
constant variable in this investigation.