2015
Step 1 |
|
Step 2 |
|
Step 3 |
Get Mean Scale Score from line numbers in this
data file.
|
|
Subtract 'met min'
Scale Score.
from Mean Scale Score to get
Distance From Standard
|
|
Multiply Distance From Standard by
proportion of students in grade.
|
Grade |
Line number |
Mean Scale Score |
- |
Scale Score: met min |
= |
Distance from standard |
* |
(Students tested in grade |
/ |
Students) tested in school |
= |
Weighted Distance From Standard |
11 |
860321 |
2570 |
- |
2628 |
= |
-58 |
* |
(434 |
/ |
434)
|
= |
-58.0 |
Step 4 |
SUM Weighted Distance From Standard to get
2015 Difference From Standard for Fairfax Senior High
|
-58 |
2016
Step 1 |
|
Step 2 |
|
Step 3 |
Get Mean Scale Score from line numbers in this
data file.
|
|
Subtract 'met min'
Scale Score.
from Mean Scale Score to get
Distance From Standard
|
|
Multiply Distance From Standard by
proportion of students in grade.
|
Grade |
Line number |
Mean Scale Score |
- |
Scale Score: met min |
= |
Distance from standard |
* |
(Students tested in grade |
/ |
Students) tested in school |
= |
Weighted Distance From Standard |
11 |
27222 |
2570 |
- |
2628 |
= |
-58 |
* |
(406 |
/ |
406)
|
= |
-58.0 |
Step 4 |
SUM Weighted Distance From Standard to get
2016 Difference From Standard for Fairfax Senior High
|
-58 |
2017
Step 1 |
|
Step 2 |
|
Step 3 |
Get Mean Scale Score from line numbers in this
data file.
|
|
Subtract 'met min'
Scale Score.
from Mean Scale Score to get
Distance From Standard
|
|
Multiply Distance From Standard by
proportion of students in grade.
|
Grade |
Line number |
Mean Scale Score |
- |
Scale Score: met min |
= |
Distance from standard |
* |
(Students tested in grade |
/ |
Students) tested in school |
= |
Weighted Distance From Standard |
11 |
27802 |
2579 |
- |
2628 |
= |
-49 |
* |
(472 |
/ |
472)
|
= |
-49.0 |
Step 4 |
SUM Weighted Distance From Standard to get
2017 Difference From Standard for Fairfax Senior High
|
-49 |
2018
Step 1 |
|
Step 2 |
|
Step 3 |
Get Mean Scale Score from line numbers in this
data file.
|
|
Subtract 'met min'
Scale Score.
from Mean Scale Score to get
Distance From Standard
|
|
Multiply Distance From Standard by
proportion of students in grade.
|
Grade |
Line number |
Mean Scale Score |
- |
Scale Score: met min |
= |
Distance from standard |
* |
(Students tested in grade |
/ |
Students) tested in school |
= |
Weighted Distance From Standard |
11 |
27850 |
2562 |
- |
2628 |
= |
-66 |
* |
(398 |
/ |
398)
|
= |
-66.0 |
Step 4 |
SUM Weighted Distance From Standard to get
2018 Difference From Standard for Fairfax Senior High
|
-66 |
2019
Step 1 |
|
Step 2 |
|
Step 3 |
Get Mean Scale Score from line numbers in this
data file.
|
|
Subtract 'met min'
Scale Score.
from Mean Scale Score to get
Distance From Standard
|
|
Multiply Distance From Standard by
proportion of students in grade.
|
Grade |
Line number |
Mean Scale Score |
- |
Scale Score: met min |
= |
Distance from standard |
* |
(Students tested in grade |
/ |
Students) tested in school |
= |
Weighted Distance From Standard |
11 |
28030 |
2586 |
- |
2628 |
= |
-42 |
* |
(286 |
/ |
286)
|
= |
-42.0 |
Step 4 |
SUM Weighted Distance From Standard to get
2019 Difference From Standard for Fairfax Senior High
|
-42 |
Last steps
Compute the average
2015 |
2016 |
2017 |
2018 |
2019 |
Sum |
Average |
-58
|
-58
|
-49
|
-66
|
-42
|
-273.0 |
-54.6 |
Compute the Upper Control Limit
Simply compute the standard deviation and multiply by 3 and add to the average: -27.6
Compute the Lower Control Limit
Simply compute the standard deviation and multiply by 3 and subtract from the average: -81.6
For the lines, you have the data necessary to plot the chart.
Very last step
The percent of students getting a Free or Reduced Price Meal comes from the following sources: