Fix italics instead of maths mode

Chapter_5.html

@@ -484,8 +484,8 @@ <h1><span class="header-section-number">Chapter 5</span> Types of variables<a hr
 <p>A variable is any property that is measured in an observation <span class="citation">(<a href="#ref-Sokal1995" role="doc-biblioref">Sokal &amp; Rohlf, 1995</a>)</span>, i.e., anything that varies among things that we can measure <span class="citation">(<a href="#ref-Dytham2011" role="doc-biblioref">Dytham, 2011</a>)</span>.
 We can summarise how these measurements vary with summary statistics, or visually with figures.
 Often, we will want to predict one variable from a second variable.
-In this case, the variable that we want to predict is called the <strong>response variable</strong>, also known as the <strong>dependent variable</strong> or <strong><em>Y</em></strong> variable (‘dependent’ because it <em>depends</em> on other variables, and ‘<span class="math inline">\(Y\)</span>’ because this is the letter we often use to represent it).
-The variable that we use to predict our response variable is the <strong>explanatory variable</strong>, also known as the <strong>independent variable</strong> or <strong><em>X</em></strong> variable (‘independent’ because it does not depend on other variables, and ‘<span class="math inline">\(X\)</span>’ because this is the letter most often used to represent it).
+In this case, the variable that we want to predict is called the <strong>response variable</strong>, also known as the <strong>dependent variable</strong> or <strong><em>Y</em></strong> variable (‘dependent’ because it <em>depends</em> on other variables, and ‘<em>Y</em>’ because this is the letter we often use to represent it).
+The variable that we use to predict our response variable is the <strong>explanatory variable</strong>, also known as the <strong>independent variable</strong> or <strong><em>X</em></strong> variable (‘independent’ because it does not depend on other variables, and ‘<em>X</em>’ because this is the letter most often used to represent it).
 There are several different types of variables:</p>
 <ul>
 <li><p><strong>Categorical</strong> variables take on a fixed number of discrete values <span class="citation">(<a href="#ref-Spiegelhalter2019" role="doc-biblioref">Spiegelhalter, 2019</a>)</span>.