# Homework 04: Summaries and Plots By Group

Due date: 2022-10-03

We’ll use the dataset `donkeys`, that I store online. Use the following code at the top of your Quarto document for this lab to load this data set.

``````finches <-

Read the help file about donkeys, to better understand the data set.

Please submit a folder containing your Quarto input (qmd) and output (html) documents for this homework, named `Homework 04`, to our shared Google Drive folder when you are finished.

1. Use the `dplyr` functions `summarise` and `group_by` to calculate the following summary statistics on a numeric variable of your choice grouped by the variable `Sex`: mean, standard deviation, median, first quartile, third quartile, minimum, and maximum (use the functions `min` and `max`, respectively).

2. Using your calculations in 1., what type of skew, if any, does your numerical variable have for each `Sex`? Why?

3. Explain, in the context of these data, two of your summary statistics.

4. Make multiple histograms (in one plot) of your numerical variable, where the histograms are split on the variable `Sex`.

5. Make box plots of your numerical variable split by the variable `Sex`.

6. Use the `dplyr` function `mutate` to create a new ratio variable using any two numerical variables of your choice.

7. Make box plots or histograms, whichever you prefer, split by the variable `Sex` of your new ratio variable. Explain one interesting aspect of this new numeric variable in context of the data.