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Q
uantitative
R
easoning &
P
roblem
S
olving
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© 2014 Pacific Crest
W
hat Do You Already Know?
Tapping into your existing knowledge
1. Why would diet and activity be used in the what-if analysis while information such as age and height
remain constant?
2. How did you choose the range for the diet and exercise inputs of the model?
3. What are the effects of changing the diet while keeping the amount of activity fixed?
4. What are the effects of changing the activities while keeping the diet fixed?
5. Which effect has more impact on the change in weight according to the model?
M
athematical Language
Terms and notation
OFAT
– one-factor-at-a-time is an approach to what-if modeling and experimentation whereby each
input is varied one at a time, as opposed to simultaneously, while the others remain fixed
uncertainty analysis
– an approach to modeling that aims to quantify the variability in the output as
a function of uncertainty in the model inputs
variation
– the amount of change or difference between values of a variable
what-if modeling
– the process of changing values for the input in a mathematical model to see how
the output will be affected by those changes
I
nformation
What you need to know
R
esources