##### Enter Confidence Interval, example 1,9

Calculate the margin of error and sample mean for

a confidence interval of (1,9)

##### Calculate interval size:

Interval Size = 9 - 1

Interval Size = 8

##### Calculate the margin of error:

 Margin of Error  = ±Interval Size 2

 Margin of Error  = ±8 2

Margin of Error = ±4

##### Calculate sample mean:

The sample mean is just the midpoint of the confidence interval

 Sample Mean x  = Interval Size 2

 Sample Mean x  = 9 + 1 2

 Sample Mean x  = 10 2

Margin of Error = ±4

#### You have 2 free calculationss remaining

Margin of Error = ±4
##### How does the Margin of Error from Confidence Interval Calculator work?
Free Margin of Error from Confidence Interval Calculator - Given a confidence interval, this determines the margin of error and sample mean.
This calculator has 1 input.

### What 2 formulas are used for the Margin of Error from Confidence Interval Calculator?

Interval Size = x2 - x1
Margin of Error = ±Interval Size/2

For more math formulas, check out our Formula Dossier

### What 3 concepts are covered in the Margin of Error from Confidence Interval Calculator?

confidence interval
a range of values so defined that there is a specified probability that the value of a parameter lies within it.
margin of error
a statistic expressing the amount of random sampling error in the results of a survey.
σp + z-score
mean
A statistical measurement also known as the average