Understanding Margin of Error Concepts

The video tutorial explains the concept of margin of error in polls, detailing how it indicates the accuracy of poll results. It covers the formula for calculating margin of error based on the number of people surveyed and provides a step-by-step example. Additionally, it demonstrates how to determine the number of people surveyed from a given margin of error.

What does the margin of error indicate in a poll?

• The time taken to conduct the poll

• The total number of questions in the poll

• The accuracy of the poll results

• The exact number of people who participated

How is the margin of error typically expressed?

• As a percentage

• As a decimal

• As a whole number

• As a fraction

What does a margin of error of plus or minus 5% indicate?

• The poll surveyed 5% of the population

• The poll is 95% inaccurate

• The poll is 5% accurate

• The results can vary by 5%

What confidence level is typically associated with a margin of error?

• 100%

• 95%

• 75%

• 50%

What happens to the margin of error if the number of people surveyed increases?

• It remains the same

• It becomes unpredictable

• It decreases

• It increases

What is the formula for calculating the margin of error?

• Plus or minus one over the number of people surveyed

• Plus or minus the square root of the number of people surveyed

• Plus or minus one over the square root of the number of people surveyed

• Plus or minus the number of people surveyed squared

What does a high number of surveyed people imply about the margin of error?

• The margin of error is unpredictable

• The margin of error is low

• The margin of error is unchanged

• The margin of error is high

What is the effect of a small sample size on the margin of error?

• It makes the margin of error zero

• It has no effect

• It increases the margin of error

• It decreases the margin of error

In a survey of 900 people, what is the first step to calculate the margin of error?

• Take the square root of 900

• Subtract 100 from 900

• Multiply 900 by 2

• Divide 900 by 2

What is the margin of error in decimal form for a survey of 900 people?

• 0.0333

• 0.3333

• 0.00333

• 0.03333