" name="q7" value="3"> d) It represents the covariance matrix of the data.</label></li>
            </ul>
            <div class="feedback" id="feedback7"></div>
        </div>

        <div class="question">
            <p>What property must a matrix \( Z \) representing cluster assignments satisfy?</p>
            <ul class="options">
                <li><label><input type="radio" name="q8" value="0"> a) Each row must sum to 1</label></li>
                <li><label><input type="radio" name="q8" value="1"