Mean, Standard Deviation, and Margin of Error
View the Lesson | MATHguide homepage Updated March 21st, 2018


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Given: Sentences were chosen at random from J. R. R. Tolkien's book The Lord of the Rings. The number of words in the sentences were counted. This is the result.

20616322921128182121
15121523171218222161214
Problem:Use the data above to: a) determine the mean and sample standard deviation, b) calculate a 95% margin of error, c) determine the respective confidence interval.

 
 Mean (x̄) =

Sample Standard Deviation (s) =

Margin of Error =

The confidence interval is [, ]