1. Estimating large numbers
Estimating Crowds
Estimating large numbers

2. President John F. Kennedy’s Inauguration
Estimating Crowds
How many people attended John F. Kennedy’s inauguration?
According to some estimates, only 20,000 people attended the inauguration of President John F. Kennedy.
President John F. Kennedy’s Inauguration

3. Dr. Martin Luther King, Jr.’s “I Have A Dream” speech
Estimating Crowds
How many people attended Dr. Martin Luther King delivered his “I Have a Dream” speech?
Approximately 250,000 people attended Dr. Martin Luther King, Jr.’s “I Have a Dream” speech.
Dr. Martin Luther King, Jr.’s
“I Have A Dream” speech

4. Estimating Crowds How many people were at Woodstock?
It is estimated that more than 500,00 people attended the Woodstock music festival.
Woodstock

5. Estimating Crowds How many people attended the Million Man March?
Despite the name, estimates put participation numbers in the Million Man March more conservatively at around 400,000.
Million Man March

6. President Barack Obama’s 1st Inauguration
Estimating Crowds
How many people attended President Barack Obama’s 1st Inauguration?
The crowd in attendance for President Barack Obama’s first inauguration is calculated at 1.8 million.
President Barack Obama’s 1st Inauguration

7. Women’s March on Washington
Estimating Crowds
How many people participated in the Women’s March on Washington?
The Women’s March on Washington drew around 500,000.
Women’s March on Washington

8. President Donald Trump’s Inauguration
Estimating Crowds
How many people attended President Donald Trump’s Inauguration?
Trump estimated attendance at his inauguration at over a million. Independent sources estimate as low as 300,000 to as high as 600,000, settling at around 450,000 people in attendance.
President Donald Trump’s Inauguration

9. Estimating Crowds
Left: President Obama’s inauguration estimated at 1.8 million.
Right: President Trump’s inauguration estimated at 450,000.

10. Estimating Crowds A better view for comparison.
Left: President Obama’s inauguration.
Right: President Trump’s inauguration.
Left: 1,800,000 people (estimated)
Right: 450,000 people (estimated)

11. Estimating Crowds
The normal method used by most agencies and news organizations for estimating crowd size if by examining a series of sample squares and estimating the total population.
Most of the time the samples are the same size. But sometimes, the individual making the estimates vary the size of the sample squares. In either case, they rely on the sample mean to calculate the total estimated population.