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Add an example of plotting error bars for grouped experimental data #30224

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@malekzada

Description

@malekzada

Add grouped error‑bar plot example to gallery

Add a demo script to galleries/examples/statistics/errorbar_features.py showing how to plot mean ± standard error for multiple groups.

Reason

Error bars are important in data analysis to communicate uncertainty. A clear grouped example helps analysts present summary statistics effectively.

Proposed Plot

  • Synthetic DataFrame with groups: group, measurement.
  • Compute mean and SEM per group using Pandas.
  • Plot with plt.errorbar() and labeled axes.
  • Add explanatory comments and optional savefig.

Benefits: Teaches group-aggregation and uncertainty visualization.

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