AML Data Analysis & Reporting 2

Question 1

When analyzing a dataset with heavy right skew, which transformation is most commonly applied before modeling?

Accepted Answer

Log transformation

Answer

Log transformation compresses large values and reduces right skew, making distributions more symmetric for modeling.

Question 2

In a confusion matrix for a binary classifier, which metric is computed as TP / (TP + FP)?

Accepted Answer

Precision

Answer

Precision measures the proportion of positive predictions that are actually positive: TP / (TP + FP).

Question 3

A data analyst notices that two features have a Pearson correlation of 0.98. What is the primary concern?

Accepted Answer

Multicollinearity

Answer

A near-perfect correlation between two predictors indicates multicollinearity, which can destabilize regression coefficient estimates.

Question 4

Which visualization is most appropriate for displaying the distribution of a continuous variable across multiple categories?

Accepted Answer

Violin plot

Answer

Violin plots combine a box plot with a kernel density estimate, effectively showing distribution shape across categories.

Question 5

In time-series analysis, what does the autocorrelation function (ACF) measure?

Accepted Answer

Correlation of a series with its own lagged values

Answer

ACF measures the correlation between a time series and its own past values at various lag intervals.

(AML) Advanced Machine Learning Certification Practice Test