(}\hat{B_{0}} + \hat{B_{1}}x_{i}\big{)}\Big{)}^{2}$$
                        </div>
                    </div>
                </div>
            </div>
            <div id="section2">
                <div class="unit">
                    <h3>Correlation</h3>
                    <p>Correlation is a measure of the linear relationship between two variables. It is defined for a sample as the following and takes value between +1 and −1 inclusive:</p>
                    $$r = \dfrac{s_{xy}}{\sqrt{s_{xx}}\sqr