In the iris dataset in R, how would you visualise the relationship between Species and Petal.Length?

Question

In the iris dataset in R, how would you visualise the relationship between Species and Petal.Length?

BlackTom AI · Accepted Answer

The question asks how to visualise the relationship between Species and Petal.Length in the iris dataset using R.

Since the provided options list is missing (the answer_options field is empty), I cannot evaluate multiple candidate approaches against each other. However, I can discuss the likely correct approach and illustrate how to implement it, which will help you identify the option if it appears in the full set.

Common correct approach (likely corresponding to a comparative or grouped boxplot):
- Conceptually, you want to compare the distribution of Petal.Length across the different Species. A boxplot (or violin plot) is a standard way to compare a numeric variable across groups.
- A base R implementation would be: boxplot(Petal.Length ~ Species, data = iris, main = "Petal.Length by Species", xlab = "Species", ylab = "Petal Length")
- A tidyverse/ggplot2 implementation would be: ggplot(iris, aes(x = Species, y = Petal.Length)) + geom_boxplot() + labs(title = "Petal Length by Species")

Why this approach is appropriate:
- It visualizes central tendency, dispersion, and potential differences in Petal.Length among Species in one plot.
- It handles categorical grouping (Species) on the x-axis and a continuous outcome (Petal.Length) on the y-axis, which matches the data structure.

What this would rule out as less suitable options:
- A scatter plot of Petal.Length versus a single numeric variable would not effectively display group differences across Species unless you facet by Species, which is less direct for comparing distributions.
- A plot that treats Species as a continuous variable (e.g., a line plot with Species on the y-axis) would misrepresent the data because Species is categorical, not ordinal.
- A plot focusing on Petal.Width or Sepal.Length without grouping by Species would not address the requested relationship.

If the answer options include alternatives like violin plot, beeswarm, or boxplot grouped by Species, any of those that explicitly compare Petal.Length across Species would also be correct, with violin plots offering an additional view of distribution shape.

In short, the intended correct concept is a comparative (grouped) plot of Petal.Length by Species, most commonly implemented as a boxplot (or violin plot) separated by Species, which aligns with the idea of comparing Petal.Length across the three species.

MATH1062/1005/1023 (ND) MATH1062/1005 Data Quiz 2

In the iris dataset in R, how would you visualise the relationship between Species and Petal.Length?

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