```{r setup, include=FALSE}
knitr::opts_chunk$set(echo = TRUE)
```

# Instructions

**Exercises:**  4 (20.4.6 Exercises); 1 (21.2.1 Exercises); 1 (21.5.3 Exercises); 1, 2 (23.2.1 Exercises)

**Submission:** Submit an electronic document on Gradescope. Must be submitted as a PDF file generated in RStudio. All assigned problems are chosen according to the textbook *R for Data Science*. You do not need R code to answer every question. If you answer without using R code, delete the code chunk. If the question requires R code, make sure you display R code. If the question requires a figure, make sure you display a figure. A lot of the questions can be answered in written response, but require R code and/or figures for understanding and explaining.

```{r, include=FALSE}
library(tidyverse)
```

# Chapter 20 (20.4.6 Exercises)

##  Exercise 4

### a)
```{r}
#
```

### b)
```{r}
#
```

### c)
```{r}
#
```

### d)
```{r}
#
```

# Chapter 21 (21.2.1 Exercises)

##  Exercise 1

### 1)
```{r}
#
```

### 2)
```{r}
#
```

### 3)
```{r}
#
```

### 4)
```{r}
#
```

# Chapter 21 (21.5.3 Exercises)

##  Exercise 1

### 1)
```{r}
#
```

### 2)
```{r}
#
```

### 3)
```{r}
#
```

### 4)
```{r}
#
```

# Chapter 23 (23.2.1 Exercises)

##  Exercise 1
```{r}
#
```

##  Exercise 2
```{r}
#
```
