First we need to load the penguin data set, just like last week. The dataset will be called penguins This data was collected by real scientists! Data were collected and made available by Dr. Kristen Gorman and the Palmer Station, Antarctica LTER, a member of the Long Term Ecological Research Network.
library(palmerpenguins)penguins
# A tibble: 344 × 8
species island bill_length_mm bill_depth_mm flipper_length_mm body_mass_g
<fct> <fct> <dbl> <dbl> <int> <int>
1 Adelie Torgersen 39.1 18.7 181 3750
2 Adelie Torgersen 39.5 17.4 186 3800
3 Adelie Torgersen 40.3 18 195 3250
4 Adelie Torgersen NA NA NA NA
5 Adelie Torgersen 36.7 19.3 193 3450
6 Adelie Torgersen 39.3 20.6 190 3650
7 Adelie Torgersen 38.9 17.8 181 3625
8 Adelie Torgersen 39.2 19.6 195 4675
9 Adelie Torgersen 34.1 18.1 193 3475
10 Adelie Torgersen 42 20.2 190 4250
# ℹ 334 more rows
# ℹ 2 more variables: sex <fct>, year <int>
library(tidyverse) # to make tidyverse commands available
── Attaching core tidyverse packages ──────────────────────── tidyverse 2.0.0 ──
✔ dplyr 1.1.4 ✔ readr 2.1.5
✔ forcats 1.0.0 ✔ stringr 1.5.1
✔ ggplot2 3.5.1 ✔ tibble 3.2.1
✔ lubridate 1.9.3 ✔ tidyr 1.3.1
✔ purrr 1.0.2
── Conflicts ────────────────────────────────────────── tidyverse_conflicts() ──
✖ dplyr::filter() masks stats::filter()
✖ dplyr::lag() masks stats::lag()
ℹ Use the conflicted package (<http://conflicted.r-lib.org/>) to force all conflicts to become errors
Create a vector that is the subset of the data with only penguins that live on Torgersen. How many penguins is this?
Of the penguins that live on Torgersen, how many have flippers shorter than 190mm?
Of the penguins that live on Torgersen, what percentage are female?
There are three different species of penguins in this dataset. We can see from the photo below that they may have different body dimensions.
What is the mean and standard deviation of body mass for each penguin species? (Hint: use group_by/summarize)
What is the mean and standard deviation of bill length for each penguin species?
The penguins live on different islands. The islands are different sizes and located in different locations within the Palmer Archipelago. This could affect the avaibility of prey, habitat, etc.
Do the Adelie penguins living on Torgersen Island have a different mean body mass than the Adelie penguins living on Biscoe?
Do the female Adelie penguins living on Torgersen Island have a different mean body mass than the female Adelie penguins living on Biscoe? Calculate both the mean and standard deviation of body mass for both groups.
What is the maximum bill depth of penguins for each island?
What is the percentage of female penguins present in the entire dataset?
During which year did the scientists measure the most penguins? (Hint: how many penguins are in the data set per year)
