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How do you import Matplotlib’s pyplot module with the conventional alias?

What is the purpose of plt.tight_layout() in Matplotlib?

What does plt.savefig(‘chart.png’, dpi=300) do?

To add a title to a Matplotlib chart, you use __.

A scatter plot is BEST used for:

A company conducted an A/B test comparing two email subject lines. Version A (n=5000) had a 4.2% open rate, Version B (n=5000) had a 4.8% open rate. Explain how you would determine if this difference is statistically significant. What would you conclude if the p-value is 0.12 versus if it is 0.02? Why is statistical significance important for business decisions?

In hypothesis testing, what does a p-value of 0.03 mean when alpha = 0.05?

In scikit-learn, which method is used to make predictions with a trained model?

When dealing with imbalanced classes (e.g., 95% negative, 5% positive), what is a major concern with using accuracy alone?

In scikit-learn, the learned slope coefficients are stored in model.__.