Fix chapter -> part

preface.Rmd

@@ -68,14 +68,14 @@ References for the sources of the real data are provided at the end of the book.
 #### Computing with R {.unnumbered}
 
 The narrative and the exercises in the book are computing language agnostic, however while it's possible to learn about modern statistics without computing, it's not possible to apply it.
-Therefore, we invite you to navigate the concepts you have learned in each chapter using the interactive R tutorials and the R labs that are included at the end of each chapter.
+Therefore, we invite you to navigate the concepts you have learned in each part using the interactive R tutorials and the R labs that are included at the end of each part.
 
 **Interactive R tutorials**
 
 The self-paced and interactive R tutorials were developed using the [learnr](https://rstudio.github.io/learnr/index.html) R package, and only an internet browser is needed to complete them.
 
 ::: {.alltutorials data-latex=""}
-Each chapter comes with a tutorial comprised of 4-8 lessons and listed like this.
+Each part comes with a tutorial comprised of 4-8 lessons and listed like this.
 :::
 
 ::: {.singletutorial data-latex=""}
@@ -99,13 +99,13 @@ You can access the full list of tutorials supporting this book [here](https://op
 
 **R labs**
 
-Once you feel comfortable with the material in the tutorials, we also encourage you to apply what you've learned via the computational labs that are also linked at the end of each chapter.
+Once you feel comfortable with the material in the tutorials, we also encourage you to apply what you've learned via the computational labs that are also linked at the end of each part.
 The labs consist of data analysis case studies, and they require access to [R](https://cran.r-project.org/) and [RStudio](https://rstudio.com/products/rstudio/).
 The first lab includes installation instructions.
 If you'd rather not install the software locally, you can also try [RStudio Cloud](https://rstudio.cloud/) for free.
 
 ::: {.singlelab data-latex=""}
-Labs for each chapter are listed like this.
+Labs for each part are listed like this.
 :::
 
 ```{asis, echo = knitr::is_latex_output()}