Problem 2: Scale Data Before Applying PCA

Problem Description

Write a Python program that scales a dataset using StandardScaler before applying PCA, demonstrating the correct preprocessing order.

Input

A dataset with features of different scales.

Output

The PCA-transformed data, using properly scaled input.

Constraints

• At least 5 data rows.

Example Input

text
(A dataset with features like age and salary, of very different scales)

Example Output

text
(PCA-transformed data based on properly scaled features)

Concepts Covered

StandardScaler, PCA, correct preprocessing order.