added preface text about worksheets; minor typo fixes in intro, setup

Author: trevorcampbell

inference.Rmd

@@ -1161,9 +1161,10 @@ statistical techniques you may learn about in the future!
 ## Exercises
 
 Practice exercises for the material covered in this chapter 
-can be found in the two accompanying worksheets([first](https://ubc-dsci.github.io/data-science-a-first-intro-worksheets/worksheet_11/worksheet_11.ipynb) 
-and [second](https://ubc-dsci.github.io/data-science-a-first-intro-worksheets/worksheet_12/worksheet_12.ipynb)).
-The worksheet tries to provide automated feedback 
+can be found in the two accompanying worksheets
+([first worksheet](https://ubc-dsci.github.io/data-science-a-first-intro-worksheets/worksheet_11/worksheet_11.ipynb) 
+and [second worksheet](https://ubc-dsci.github.io/data-science-a-first-intro-worksheets/worksheet_12/worksheet_12.ipynb)).
+The worksheets try to provide automated feedback 
 and help guide you through the problems. 
 To make sure this functionality works as intended, 
 please follow the instructions for computer setup needed to run the worksheets 

preface-text.Rmd

@@ -47,3 +47,17 @@ try out the example code that we include throughout the book.
 ```{r img-chapter-overview, echo = FALSE, message = FALSE, warning = FALSE, fig.cap = "Where are we going?", out.width="100%", fig.retina = 2, fig.align = "center"}
 knitr::include_graphics("img/chapter_overview.jpeg")
 ```
+
+Each chapter in the book has an accompanying worksheet that provides exercises
+to help you practice the concepts you will learn. We strongly recommend that you
+work through the worksheet when you finish reading each chapter 
+before moving on to the next chapter. All of the worksheets
+are available at 
+[https://github.com/UBC-DSCI/data-science-a-first-intro-worksheets](https://github.com/UBC-DSCI/data-science-a-first-intro-worksheets);
+the "Exercises" section at the end of each chapter points you to the right worksheet for that chapter.
+The worksheets are designed to provide automated feedback and help guide you through the problems.
+To make sure that functionality works as intended, make sure to follow the setup directions 
+in Chapter \@ref(move-to-your-own-machine) regarding downloading the worksheets.
+
+
+

setup.Rmd

@@ -11,7 +11,7 @@ By the end of the chapter, readers will be able to:
 
 - install the Git version control software
 - install and launch a local instance of JupyterLab with the R kernel
-- download the exercises in the worksheets that accompany the chapters of this book from GitHub
+- download the worksheets that accompany the chapters of this book from GitHub
 
 ## Installing software on your own computer
 
@@ -239,10 +239,8 @@ correctly sourced. This includes JupyterLab, terminal or Anaconda Prompt.
 
 The worksheets containing practice exercises for this book 
 can be downloaded by visiting 
-[https://github.com/UBC-DSCI/data-science-a-first-intro-worksheets](https://github.com/UBC-DSCI/data-science-a-first-intro-worksheets)
-and clicking the green "Code" button and then selecting "Download ZIP".
-The worksheets are contained within the compressed folder that will be downloaded.
-They can be uncompressed/unzipped using tools from your computers filesystem
-and run using Jupyter. 
-See chapter \@ref(getting-started-with-jupyter) 
-for instructions on how to use Jupyter.
+[https://github.com/UBC-DSCI/data-science-a-first-intro-worksheets](https://github.com/UBC-DSCI/data-science-a-first-intro-worksheets),
+clicking the green "Code" button, and then selecting "Download ZIP".
+The worksheets are contained within the compressed zip folder that will be downloaded.
+Once you unzip the downloaded file, you can open the folder and run each worksheet
+using Jupyter. See Chapter \@ref(getting-started-with-jupyter) for instructions on how to use Jupyter.