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diff --git a/01_variables.html b/01_variables.html
@@ -376,8 +376,7 @@ <h2> Contents </h2>
 <div id="searchbox"></div>
                 <article class="bd-article">
 
-  <p>Printed copies of <em>Elements of Data Science</em> are available now, with a <strong>full color interior</strong>.</p>
-<p>From July 17 to July 31, <a class="reference external" href="https://www.lulu.com/shop/allen-downey/elements-of-data-science/paperback/product-9dyrwn.html">get 20% off at Lulu.com</a>.</p>
+  <p>Printed copies of <em>Elements of Data Science</em> are available now, with a <strong>full color interior</strong>, from <a class="reference external" href="https://www.lulu.com/shop/allen-downey/elements-of-data-science/paperback/product-9dyrwn.html">Lulu.com</a>.</p>
 <section class="tex2jax_ignore mathjax_ignore" id="variables-and-values">
 <h1>Variables and Values<a class="headerlink" href="#variables-and-values" title="Link to this heading">#</a></h1>
 <p>The topics in this chapter are:</p>

diff --git a/02_times.html b/02_times.html
@@ -379,8 +379,7 @@ <h2> Contents </h2>
 <div id="searchbox"></div>
                 <article class="bd-article">
 
-  <p>Printed copies of <em>Elements of Data Science</em> are available now, with a <strong>full color interior</strong>.</p>
-<p>From July 17 to July 31, <a class="reference external" href="https://www.lulu.com/shop/allen-downey/elements-of-data-science/paperback/product-9dyrwn.html">get 20% off at Lulu.com</a>.</p>
+  <p>Printed copies of <em>Elements of Data Science</em> are available now, with a <strong>full color interior</strong>, from <a class="reference external" href="https://www.lulu.com/shop/allen-downey/elements-of-data-science/paperback/product-9dyrwn.html">Lulu.com</a>.</p>
 <section class="tex2jax_ignore mathjax_ignore" id="times-and-places">
 <h1>Times and Places<a class="headerlink" href="#times-and-places" title="Link to this heading">#</a></h1>
 <p><a class="reference external" href="https://colab.research.google.com/github/AllenDowney/ElementsOfDataScience/blob/v1/02_times.ipynb">Click here to run this notebook on Colab</a>.</p>

diff --git a/03_arrays.html b/03_arrays.html
@@ -377,8 +377,7 @@ <h2> Contents </h2>
 <div id="searchbox"></div>
                 <article class="bd-article">
 
-  <p>Printed copies of <em>Elements of Data Science</em> are available now, with a <strong>full color interior</strong>.</p>
-<p>From July 17 to July 31, <a class="reference external" href="https://www.lulu.com/shop/allen-downey/elements-of-data-science/paperback/product-9dyrwn.html">get 20% off at Lulu.com</a>.</p>
+  <p>Printed copies of <em>Elements of Data Science</em> are available now, with a <strong>full color interior</strong>, from <a class="reference external" href="https://www.lulu.com/shop/allen-downey/elements-of-data-science/paperback/product-9dyrwn.html">Lulu.com</a>.</p>
 <section class="tex2jax_ignore mathjax_ignore" id="lists-and-arrays">
 <h1>Lists and Arrays<a class="headerlink" href="#lists-and-arrays" title="Link to this heading">#</a></h1>
 <p><a class="reference external" href="https://colab.research.google.com/github/AllenDowney/ElementsOfDataScience/blob/v1/03_arrays.ipynb">Click here to run this notebook on Colab</a>.</p>

diff --git a/04_loops.html b/04_loops.html
@@ -376,8 +376,7 @@ <h2> Contents </h2>
 <div id="searchbox"></div>
                 <article class="bd-article">
 
-  <p>Printed copies of <em>Elements of Data Science</em> are available now, with a <strong>full color interior</strong>.</p>
-<p>From July 17 to July 31, <a class="reference external" href="https://www.lulu.com/shop/allen-downey/elements-of-data-science/paperback/product-9dyrwn.html">get 20% off at Lulu.com</a>.</p>
+  <p>Printed copies of <em>Elements of Data Science</em> are available now, with a <strong>full color interior</strong>, from <a class="reference external" href="https://www.lulu.com/shop/allen-downey/elements-of-data-science/paperback/product-9dyrwn.html">Lulu.com</a>.</p>
 <section class="tex2jax_ignore mathjax_ignore" id="loops-and-files">
 <h1>Loops and Files<a class="headerlink" href="#loops-and-files" title="Link to this heading">#</a></h1>
 <p><a class="reference external" href="https://colab.research.google.com/github/AllenDowney/ElementsOfDataScience/blob/v1/04_loops.ipynb">Click here to run this notebook on Colab</a>.</p>

diff --git a/05_dictionaries.html b/05_dictionaries.html
@@ -375,8 +375,7 @@ <h2> Contents </h2>
 <div id="searchbox"></div>
                 <article class="bd-article">
 
-  <p>Printed copies of <em>Elements of Data Science</em> are available now, with a <strong>full color interior</strong>.</p>
-<p>From July 17 to July 31, <a class="reference external" href="https://www.lulu.com/shop/allen-downey/elements-of-data-science/paperback/product-9dyrwn.html">get 20% off at Lulu.com</a>.</p>
+  <p>Printed copies of <em>Elements of Data Science</em> are available now, with a <strong>full color interior</strong>, from <a class="reference external" href="https://www.lulu.com/shop/allen-downey/elements-of-data-science/paperback/product-9dyrwn.html">Lulu.com</a>.</p>
 <section class="tex2jax_ignore mathjax_ignore" id="dictionaries">
 <h1>Dictionaries<a class="headerlink" href="#dictionaries" title="Link to this heading">#</a></h1>
 <p><a class="reference external" href="https://colab.research.google.com/github/AllenDowney/ElementsOfDataScience/blob/v1/05_dictionaries.ipynb">Click here to run this notebook on Colab</a> or

diff --git a/06_plotting.html b/06_plotting.html
@@ -377,8 +377,7 @@ <h2> Contents </h2>
 <div id="searchbox"></div>
                 <article class="bd-article">
 
-  <p>Printed copies of <em>Elements of Data Science</em> are available now, with a <strong>full color interior</strong>.</p>
-<p>From July 17 to July 31, <a class="reference external" href="https://www.lulu.com/shop/allen-downey/elements-of-data-science/paperback/product-9dyrwn.html">get 20% off at Lulu.com</a>.</p>
+  <p>Printed copies of <em>Elements of Data Science</em> are available now, with a <strong>full color interior</strong>, from <a class="reference external" href="https://www.lulu.com/shop/allen-downey/elements-of-data-science/paperback/product-9dyrwn.html">Lulu.com</a>.</p>
 <section class="tex2jax_ignore mathjax_ignore" id="plotting">
 <h1>Plotting<a class="headerlink" href="#plotting" title="Link to this heading">#</a></h1>
 <p><a class="reference external" href="https://colab.research.google.com/github/AllenDowney/ElementsOfDataScience/blob/v1/06_plotting.ipynb">Click here to run this notebook on Colab</a>.</p>

diff --git a/07_dataframes.html b/07_dataframes.html
@@ -379,8 +379,7 @@ <h2> Contents </h2>
 <div id="searchbox"></div>
                 <article class="bd-article">
 
-  <p>Printed copies of <em>Elements of Data Science</em> are available now, with a <strong>full color interior</strong>.</p>
-<p>From July 17 to July 31, <a class="reference external" href="https://www.lulu.com/shop/allen-downey/elements-of-data-science/paperback/product-9dyrwn.html">get 20% off at Lulu.com</a>.</p>
+  <p>Printed copies of <em>Elements of Data Science</em> are available now, with a <strong>full color interior</strong>, from <a class="reference external" href="https://www.lulu.com/shop/allen-downey/elements-of-data-science/paperback/product-9dyrwn.html">Lulu.com</a>.</p>
 <section class="tex2jax_ignore mathjax_ignore" id="dataframes-and-series">
 <h1>DataFrames and Series<a class="headerlink" href="#dataframes-and-series" title="Link to this heading">#</a></h1>
 <p><a class="reference external" href="https://colab.research.google.com/github/AllenDowney/ElementsOfDataScience/blob/v1/07_dataframes.ipynb">Click here to run this notebook on Colab</a>.</p>

diff --git a/08_distributions.html b/08_distributions.html
@@ -380,8 +380,7 @@ <h2> Contents </h2>
 <div id="searchbox"></div>
                 <article class="bd-article">
 
-  <p>Printed copies of <em>Elements of Data Science</em> are available now, with a <strong>full color interior</strong>.</p>
-<p>From July 17 to July 31, <a class="reference external" href="https://www.lulu.com/shop/allen-downey/elements-of-data-science/paperback/product-9dyrwn.html">get 20% off at Lulu.com</a>.</p>
+  <p>Printed copies of <em>Elements of Data Science</em> are available now, with a <strong>full color interior</strong>, from <a class="reference external" href="https://www.lulu.com/shop/allen-downey/elements-of-data-science/paperback/product-9dyrwn.html">Lulu.com</a>.</p>
 <section class="tex2jax_ignore mathjax_ignore" id="distributions">
 <h1>Distributions<a class="headerlink" href="#distributions" title="Link to this heading">#</a></h1>
 <p><a class="reference external" href="https://colab.research.google.com/github/AllenDowney/ElementsOfDataScience/blob/v1/08_distributions.ipynb">Click here to run this notebook on Colab</a>.</p>

diff --git a/09_relationships.html b/09_relationships.html
@@ -374,8 +374,7 @@ <h2> Contents </h2>
 <div id="searchbox"></div>
                 <article class="bd-article">
 
-  <p>Printed copies of <em>Elements of Data Science</em> are available now, with a <strong>full color interior</strong>.</p>
-<p>From July 17 to July 31, <a class="reference external" href="https://www.lulu.com/shop/allen-downey/elements-of-data-science/paperback/product-9dyrwn.html">get 20% off at Lulu.com</a>.</p>
+  <p>Printed copies of <em>Elements of Data Science</em> are available now, with a <strong>full color interior</strong>, from <a class="reference external" href="https://www.lulu.com/shop/allen-downey/elements-of-data-science/paperback/product-9dyrwn.html">Lulu.com</a>.</p>
 <section class="tex2jax_ignore mathjax_ignore" id="relationships">
 <h1>Relationships<a class="headerlink" href="#relationships" title="Link to this heading">#</a></h1>
 <p><a class="reference external" href="https://colab.research.google.com/github/AllenDowney/ElementsOfDataScience/blob/v1/09_relationships.ipynb">Click here to run this notebook on Colab</a>.</p>

diff --git a/10_regression.html b/10_regression.html
@@ -375,8 +375,7 @@ <h2> Contents </h2>
 <div id="searchbox"></div>
                 <article class="bd-article">
 
-  <p>Printed copies of <em>Elements of Data Science</em> are available now, with a <strong>full color interior</strong>.</p>
-<p>From July 17 to July 31, <a class="reference external" href="https://www.lulu.com/shop/allen-downey/elements-of-data-science/paperback/product-9dyrwn.html">get 20% off at Lulu.com</a>.</p>
+  <p>Printed copies of <em>Elements of Data Science</em> are available now, with a <strong>full color interior</strong>, from <a class="reference external" href="https://www.lulu.com/shop/allen-downey/elements-of-data-science/paperback/product-9dyrwn.html">Lulu.com</a>.</p>
 <section class="tex2jax_ignore mathjax_ignore" id="regression">
 <h1>Regression<a class="headerlink" href="#regression" title="Link to this heading">#</a></h1>
 <div class="cell tag_remove-print docutils container">

diff --git a/11_resampling.html b/11_resampling.html
@@ -374,8 +374,7 @@ <h2> Contents </h2>
 <div id="searchbox"></div>
                 <article class="bd-article">
 
-  <p>Printed copies of <em>Elements of Data Science</em> are available now, with a <strong>full color interior</strong>.</p>
-<p>From July 17 to July 31, <a class="reference external" href="https://www.lulu.com/shop/allen-downey/elements-of-data-science/paperback/product-9dyrwn.html">get 20% off at Lulu.com</a>.</p>
+  <p>Printed copies of <em>Elements of Data Science</em> are available now, with a <strong>full color interior</strong>, from <a class="reference external" href="https://www.lulu.com/shop/allen-downey/elements-of-data-science/paperback/product-9dyrwn.html">Lulu.com</a>.</p>
 <section class="tex2jax_ignore mathjax_ignore" id="resampling">
 <h1>Resampling<a class="headerlink" href="#resampling" title="Link to this heading">#</a></h1>
 <div class="cell tag_remove-print docutils container">
@@ -557,7 +556,7 @@ <h2>Simulating One Group<a class="headerlink" href="#simulating-one-group" title
 </div>
 </div>
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-<div class="output text_plain highlight-myst-ansi notranslate"><div class="highlight"><pre><span></span>array([1, 0, 0, 0, 0, 1, 1, 1, 1, 1])
+<div class="output text_plain highlight-myst-ansi notranslate"><div class="highlight"><pre><span></span>array([1, 0, 1, 1, 1, 1, 1, 1, 1, 0])
 </pre></div>
 </div>
 </div>
@@ -584,7 +583,7 @@ <h2>Simulating One Group<a class="headerlink" href="#simulating-one-group" title
 </div>
 </div>
 <div class="cell_output docutils container">
-<div class="output text_plain highlight-myst-ansi notranslate"><div class="highlight"><pre><span></span>4.883391903610059
+<div class="output text_plain highlight-myst-ansi notranslate"><div class="highlight"><pre><span></span>5.294144493633334
 </pre></div>
 </div>
 </div>
@@ -615,7 +614,7 @@ <h2>Simulating One Group<a class="headerlink" href="#simulating-one-group" title
 </div>
 </div>
 <div class="cell_output docutils container">
-<img alt="_images/7e682b79c3b9f906fe34e4b50034c6d3f2b1650479a4419fb910e842833e9383.png" src="_images/7e682b79c3b9f906fe34e4b50034c6d3f2b1650479a4419fb910e842833e9383.png" />
+<img alt="_images/9403253e7d1c710973e48f11c2f481541c98749a35e9fed906f90c52d10909e5.png" src="_images/9403253e7d1c710973e48f11c2f481541c98749a35e9fed906f90c52d10909e5.png" />
 </div>
 </div>
 <p>The mean of this distribution is about 5.3, which is close to the observed risk, as we should expect.</p>
@@ -718,7 +717,7 @@ <h2>Simulating the Trial<a class="headerlink" href="#simulating-the-trial" title
 </div>
 </div>
 <div class="cell_output docutils container">
-<img alt="_images/3e6d2409a2cf89a0d4454fca0b6a901c28dc57d342b507edb2254e9ce25599dc.png" src="_images/3e6d2409a2cf89a0d4454fca0b6a901c28dc57d342b507edb2254e9ce25599dc.png" />
+<img alt="_images/c8d1a98d424f44f32d59fb95e54085ba97fbdb9cbc359388af64cac8a4379784.png" src="_images/c8d1a98d424f44f32d59fb95e54085ba97fbdb9cbc359388af64cac8a4379784.png" />
 </div>
 </div>
 <p>The mean of this distribution is close to the efficacy we computed with the results of the actual trial.</p>
@@ -833,7 +832,7 @@ <h2>Estimating Means<a class="headerlink" href="#estimating-means" title="Link t
 </div>
 </div>
 <div class="cell_output docutils container">
-<img alt="_images/26b923ed3af86a65bb522dfab77040ee3a6ea9c1a3c0af91e2bbd95e659a9b0c.png" src="_images/26b923ed3af86a65bb522dfab77040ee3a6ea9c1a3c0af91e2bbd95e659a9b0c.png" />
+<img alt="_images/ec2770347978626d9a5fcaf8b1fcf276c505818353e0743267492d58195371b4.png" src="_images/ec2770347978626d9a5fcaf8b1fcf276c505818353e0743267492d58195371b4.png" />
 </div>
 </div>
 <p>This result is called a <strong>sampling distribution</strong> because it represents the variation in the results due to the random sampling process.

diff --git a/12_bootstrap.html b/12_bootstrap.html
@@ -377,8 +377,7 @@ <h2> Contents </h2>
 <div id="searchbox"></div>
                 <article class="bd-article">
 
-  <p>Printed copies of <em>Elements of Data Science</em> are available now, with a <strong>full color interior</strong>.</p>
-<p>From July 17 to July 31, <a class="reference external" href="https://www.lulu.com/shop/allen-downey/elements-of-data-science/paperback/product-9dyrwn.html">get 20% off at Lulu.com</a>.</p>
+  <p>Printed copies of <em>Elements of Data Science</em> are available now, with a <strong>full color interior</strong>, from <a class="reference external" href="https://www.lulu.com/shop/allen-downey/elements-of-data-science/paperback/product-9dyrwn.html">Lulu.com</a>.</p>
 <section class="tex2jax_ignore mathjax_ignore" id="bootstrap-sampling">
 <h1>Bootstrap Sampling<a class="headerlink" href="#bootstrap-sampling" title="Link to this heading">#</a></h1>
 <p><a class="reference external" href="https://colab.research.google.com/github/AllenDowney/ElementsOfDataScience/blob/v1/12_bootstrap.ipynb">Click here to run this notebook on Colab</a>.</p>

diff --git a/13_hypothesis.html b/13_hypothesis.html
@@ -378,8 +378,7 @@ <h2> Contents </h2>
 <div id="searchbox"></div>
                 <article class="bd-article">
 
-  <p>Printed copies of <em>Elements of Data Science</em> are available now, with a <strong>full color interior</strong>.</p>
-<p>From July 17 to July 31, <a class="reference external" href="https://www.lulu.com/shop/allen-downey/elements-of-data-science/paperback/product-9dyrwn.html">get 20% off at Lulu.com</a>.</p>
+  <p>Printed copies of <em>Elements of Data Science</em> are available now, with a <strong>full color interior</strong>, from <a class="reference external" href="https://www.lulu.com/shop/allen-downey/elements-of-data-science/paperback/product-9dyrwn.html">Lulu.com</a>.</p>
 <section class="tex2jax_ignore mathjax_ignore" id="hypothesis-testing">
 <h1>Hypothesis Testing<a class="headerlink" href="#hypothesis-testing" title="Link to this heading">#</a></h1>
 <p><a class="reference external" href="https://colab.research.google.com/github/AllenDowney/ElementsOfDataScience/blob/v1/13_hypothesis.ipynb">Click here to run this notebook on Colab</a>.</p>

diff --git a/14_outro.html b/14_outro.html
@@ -359,8 +359,7 @@ <h1>Further Reading</h1>
 <div id="searchbox"></div>
                 <article class="bd-article">
 
-  <p>Printed copies of <em>Elements of Data Science</em> are available now, with a <strong>full color interior</strong>.</p>
-<p>From July 17 to July 31, <a class="reference external" href="https://www.lulu.com/shop/allen-downey/elements-of-data-science/paperback/product-9dyrwn.html">get 20% off at Lulu.com</a>.</p>
+  <p>Printed copies of <em>Elements of Data Science</em> are available now, with a <strong>full color interior</strong>, from <a class="reference external" href="https://www.lulu.com/shop/allen-downey/elements-of-data-science/paperback/product-9dyrwn.html">Lulu.com</a>.</p>
 <section class="tex2jax_ignore mathjax_ignore" id="further-reading">
 <h1>Further Reading<a class="headerlink" href="#further-reading" title="Link to this heading">#</a></h1>
 <p>The first part of this book is an accelerated introduction to Python with emphasis on tools for working with data.

diff --git a/_images/9403253e7d1c710973e48f11c2f481541c98749a35e9fed906f90c52d10909e5.png b/_images/9403253e7d1c710973e48f11c2f481541c98749a35e9fed906f90c52d10909e5.png
diff --git a/_images/c8d1a98d424f44f32d59fb95e54085ba97fbdb9cbc359388af64cac8a4379784.png b/_images/c8d1a98d424f44f32d59fb95e54085ba97fbdb9cbc359388af64cac8a4379784.png
diff --git a/_images/ec2770347978626d9a5fcaf8b1fcf276c505818353e0743267492d58195371b4.png b/_images/ec2770347978626d9a5fcaf8b1fcf276c505818353e0743267492d58195371b4.png
diff --git a/_sources/01_variables.ipynb b/_sources/01_variables.ipynb
@@ -4,9 +4,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "Printed copies of *Elements of Data Science* are available now, with a **full color interior**.\n",
-    "\n",
-    "From July 17 to July 31, [get 20% off at Lulu.com](https://www.lulu.com/shop/allen-downey/elements-of-data-science/paperback/product-9dyrwn.html)."
+    "Printed copies of *Elements of Data Science* are available now, with a **full color interior**, from [Lulu.com](https://www.lulu.com/shop/allen-downey/elements-of-data-science/paperback/product-9dyrwn.html)."
    ]
   },
   {

diff --git a/_sources/02_times.ipynb b/_sources/02_times.ipynb
@@ -4,9 +4,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "Printed copies of *Elements of Data Science* are available now, with a **full color interior**.\n",
-    "\n",
-    "From July 17 to July 31, [get 20% off at Lulu.com](https://www.lulu.com/shop/allen-downey/elements-of-data-science/paperback/product-9dyrwn.html)."
+    "Printed copies of *Elements of Data Science* are available now, with a **full color interior**, from [Lulu.com](https://www.lulu.com/shop/allen-downey/elements-of-data-science/paperback/product-9dyrwn.html)."
    ]
   },
   {

diff --git a/_sources/03_arrays.ipynb b/_sources/03_arrays.ipynb
@@ -4,9 +4,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "Printed copies of *Elements of Data Science* are available now, with a **full color interior**.\n",
-    "\n",
-    "From July 17 to July 31, [get 20% off at Lulu.com](https://www.lulu.com/shop/allen-downey/elements-of-data-science/paperback/product-9dyrwn.html)."
+    "Printed copies of *Elements of Data Science* are available now, with a **full color interior**, from [Lulu.com](https://www.lulu.com/shop/allen-downey/elements-of-data-science/paperback/product-9dyrwn.html)."
    ]
   },
   {

diff --git a/_sources/04_loops.ipynb b/_sources/04_loops.ipynb
@@ -4,9 +4,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "Printed copies of *Elements of Data Science* are available now, with a **full color interior**.\n",
-    "\n",
-    "From July 17 to July 31, [get 20% off at Lulu.com](https://www.lulu.com/shop/allen-downey/elements-of-data-science/paperback/product-9dyrwn.html)."
+    "Printed copies of *Elements of Data Science* are available now, with a **full color interior**, from [Lulu.com](https://www.lulu.com/shop/allen-downey/elements-of-data-science/paperback/product-9dyrwn.html)."
    ]
   },
   {