Explore BrainMass
Share

# Statistics - Finding Standard Deviation

This content was COPIED from BrainMass.com - View the original, and get the already-completed solution here!

** Please see the attached file for the complete problem description **

15) According to the empirical rule, what percent of data should fall between +/1 stdev? +/-2 stdev? +/- 3 stdev? How does this compare to the
a. Results for a random shape at 20 samples?
b. Results for a random shape at 200 samples?
c. Results for a bell shape at 20 samples?
d. Results for a bell shape at 200 samples?
16) How do the results from the random shape compare to the results from the bell shape? How did increasing the sample size change your assessment?

https://brainmass.com/statistics/probability/statistics-finding-standard-deviation-500709

#### Solution Preview

** Please see the attached file for the complete solution **
I have answered the questions in the attached MS Word document that was in your posting. My answers are in green. Good luck.

According to the Empirical Rule, in a data set that is mound-shaped a symmetric approximately 68.3% of the data in the data set should fall between +/- 1 stdev of the (sample) mean; approximately 95.4% of the data in the data set should fall between +/- 2 stdev of the (sample) mean; and, 99.7% of all the data in the data set (so pretty much all of the values in the data set) should fall between +/- 3 stdev of the (sample) mean.
a. Results for a random shape at ...

#### Solution Summary

In this solution we explain how to solve a series of probability problems.

\$2.19