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Update data-visualize.qmd (#1456) 

* Update data-visualize.qmd

Minor edits to make "answer" plural.

* Update data-visualize.qmd

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Co-authored-by: Mine Cetinkaya-Rundel <cetinkaya.mine@gmail.com>
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@ -66,12 +66,12 @@ Negative?
Linear?
Nonlinear?
Does the relationship vary by the species of the penguin?
And how about by the island where the penguin lives.
How about by the island where the penguin lives?
Let's create visualizations that we can use to answer these questions.
### The `penguins` data frame
You can test your answer with the `penguins` **data frame** found in palmerpenguins (a.k.a. `palmerpenguins::penguins`).
You can test your answers to those questions with the `penguins` **data frame** found in palmerpenguins (a.k.a. `palmerpenguins::penguins`).
A data frame is a rectangular collection of variables (in the columns) and observations (in the rows).
`penguins` contains `r nrow(penguins)` observations collected and made available by Dr. Kristen Gorman and the Palmer Station, Antarctica LTER[^data-visualize-2].