Standard Deviation
Standard Deviation
Steps
1. Average the results of you tests.
2. Subtract the average from each result.
3. Square all of your results from step 2.
4. Add all of the new result numbers.
5. Divide that new number by the number of trials minus one. (if you have five trials you will divide by 5 – 1 = 4)
6. Find the square root of that new number.
Example:
|TRIAL |RESULT |
|1 |2 |
|2 |4 |
|3 |6 |
|4 |8 |
|5 |5 |
Step 1: Average the results.
2 + 4 + 6 + 8 + 5 = 25
25 ( 5 = 5
Step 2: Subtract the average from each result.
2 – 5 = -3
4 – 5 = -1
6 – 5 = 1
8 – 5 = 3
5 – 5 = 0
Step 3: Square all of your results.
-3² = 9
-1² = 1
1² = 1
3² = 9
0² = 0
Step 4: Add all of the new result numbers.
9 + 1 + 1 + 9 + 0 = 20
Step 5: Divide that new number by the number of trials minus one.
20 ( (5-1)
20 ( 4 = 5
Step 6: Find the square root of that new number.
±√5 = ±2.2
The standard deviation is ±2.2. This means that when evaluating your results the margin of error is ±2.2 in either direction. Anything outside of this range would be considered insignificant.
If you have Excel and with to use its standard deviation graph, after creating the spreadsheet, choose STDP when running the graph.
................
................
In order to avoid copyright disputes, this page is only a partial summary.
To fulfill the demand for quickly locating and searching documents.
It is intelligent file search solution for home and business.
Related download
- scientific experimentation standard curve analysis
- standard deviation
- decision risk analysis
- calculating standard deviation worksheet
- activity 3 7 statistical analysis with excel answer key
- testing for normality by using a q q plot
- statistical analysis practical work assignment
- describing and interpreting data
Related searches
- standard deviation results interpretation
- reading standard deviation results
- how to explain standard deviation results
- standard deviation easy explanation
- standard deviation simplified
- standard deviation explained simply
- example of standard deviation problem
- standard deviation of the distribution calculator
- standard deviation of sampling distribution calculator
- standard deviation calculator
- standard deviation variance calculator
- standard deviation and probability calculator