Technical - Python and Statistics

Control Statements in Python

Conditional Statements

• if

• if-else

• elif

Loops

• for loop

• while loop

Difference Between for and while Loop

• for loop → fixed number of iterations

• while loop → condition-based execution

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Practice Logical Problems (Python)

Basic Logical Programs

• Prime number program

• Unique number program

• Number reversal

• Digit counting

• Simple pattern logic

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Statistics Basics

Mean

• Average value

• Formula: sum / count

• Used to find central tendency

Mode

• Most frequent value

• Used for categorical data

Median

• Middle value

• Used when data has outliers

Variance

• Measures data spread

• Indicates variability

Standard Deviation

• Square root of variance

• Shows data consistency

Range

• Difference between maximum and minimum

Quartiles

• Q1 → 25%

• Q2 → 50% (Median)

• Q3 → 75%

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Differences and Equations

Central Tendency Comparison

• Mean vs Median vs Mode

Dispersion Comparison

• Variance vs Standard Deviation

Basic Statistical Formulas

• Mean formula

• Variance formula

• Standard deviation formula

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Use of Statistics in Machine Learning

Applications in ML

• Mean → feature normalization

• Median → handling outliers

• Mode → categorical predictions

• Variance & standard deviation → model stability