Instruction: Using a provided time series dataset in a Pandas DataFrame, demonstrate how to perform a seasonal decomposition.
Context: This question assesses the candidate's ability to handle time series data in Pandas, specifically focusing on extracting trends, seasonality, and residuals. Candidates should demonstrate proficiency in using relevant Pandas functions and possibly statsmodels for decomposition. The solution should include loading the data, setting the appropriate time index, and applying a seasonal decomposition method to extract and plot the trend, seasonal, and residual components.
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To begin, let's assume we have our time series data loaded into a Pandans DataFrame named df. Our first step is ensuring that our DataFrame is indexed by time, which is crucial for time series analysis.
```python import pandas as pd...
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