correct plotting a joined data frame exercise

[goi42]

Updated the language to be more precise and corrected some references to non-existent/mis-named files and columns.

[github-actions[bot]]

Thank you!

Thank you for your pull request :smiley:

:robot: This automated message can help you check the rendered files in your submission for clarity. If you have any questions, please feel free to open an issue in {sandpaper}.

If you have files that automatically render output (e.g. R Markdown), then you should check for the following:

• :dart: correct output
• :framed_picture: correct figures
• :question: new warnings
• :bangbang: new errors

Rendered Changes

:mag: Inspect the changes: https://github.com/datacarpentry/python-ecology-lesson/compare/md-outputs..md-outputs-PR-626

The following changes were observed in the rendered markdown documents:

 05-merging-data.md | 16 ++++++++--------
 md5sum.txt         |  2 +-
 2 files changed, 9 insertions(+), 9 deletions(-)

What does this mean?

If you have source files that require output and figures to be generated (e.g. R Markdown), then it is important to make sure the generated figures and output are reproducible.

This output provides a way for you to inspect the output in a diff-friendly manner so that it's easy to see the changes that occur due to new software versions or randomisation.

:stopwatch: Updated at 2025-06-27 15:21:19 +0000