 Save the rsplit!

1. Extract the training data. Fit a linear model to it. Save the model!

1. Measure the RMSE of your linear model with your test set.  

Keep `set.seed(100)` at the start of your code.

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<code class="countdown-time"><span class="countdown-digits minutes">04</span><span class="countdown-digits colon">:</span><span class="countdown-digits seconds">00</span></code>
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```r
set.seed(100) # Import