The video tutorial explains how to use the margin of error formula to calculate either the sample size or the margin of error itself. It provides examples of calculating the required sample size for specific margins of error and demonstrates how to find the margin of error when the sample size is known. The tutorial emphasizes the importance of rounding up to ensure the margin of error does not exceed the desired percentage.

What are the two main uses of the margin of error formula?

• To calculate the standard deviation and variance

• To find the mean and median

• To determine the sample size and margin of error

• To estimate the population size and growth rate

In the first example, what is the decimal equivalent of a 3.2% margin of error?

• 0.032

• 0.32

• 3.2

• 0.0032

Why do we round up the sample size in the first example?

• To reduce the cost of the survey

• To make calculations easier

• To ensure the margin of error is not larger than desired

• To increase the accuracy of the results

In the second example, what is the decimal equivalent of a 4% margin of error?

• 4.0

• 0.04

• 0.004

• 0.4

What is the calculated sample size for a 4% margin of error before rounding?

• 625

• 650

• 601

• 600

Why is it acceptable for the margin of error to be slightly less than the desired percentage?

• It simplifies the calculations

• It ensures the margin of error is not exceeded

• It increases the accuracy of the results

• It reduces the cost of the survey

When finding the margin of error with a known sample size, what mathematical operation is performed after division?

• Multiplication

• Square rooting

• Subtraction

• Addition

What is the margin of error in percentage form when the sample size is a thousand?

• 0.39%

• 3.90%

• 3.09%

• 3.00%

What is the first step in calculating the margin of error when the sample size is known?

• Multiply by 100

• Perform division

• Square root the result

• Convert the percentage to a decimal

What is the result of dividing 9604 by the sample size in the known sample size example?

• A whole number

• A fraction

• A percentage

• A decimal value