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Simple Linear Regression: Reliability of predictions

We often use regression models to make predictions. In Figure 1 (a), we’ve fitted a model relating a household’s weekly gas consumption to the average outside temperature. We can now use the model to predict the gas consumption in a week when the outside temperature is say 6 deg C. Similarly, in Figure 1 (b), we’ve fitted a model relating the lung capacity (FEV1) of a child to their age. We can use this model to predict the lung capacity of an 8 year old.