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Check that the best model you selected in Exercise 9 meets the required conditions. In exercise Use Excel to create all possible Marks models, and

Check that the best model you selected in Exercise 9 meets the required conditions.
In exercise
Use Excel to create all possible Marks models, and then consider those that have two explanatory variables. Note that there are 10 such models. Which of these models is best, and why? Is this model a real improvement on the best single-variable model? Explain.

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