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
3	1546	2456	-	2436	=	20	*	(70	/	150)	=	9.33333332
4	1548	2504	-	2485	=	19	*	(45	/	150)	=	5.7
5	1550	2566	-	2528	=	38	*	(35	/	150)	=	8.86666665
Step 4	SUM Weighted Distance From Standard to get 2018 Difference From Standard for Lawrence Elementary											24

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
3	1573	2454	-	2436	=	18	*	(51	/	150)	=	6.12
4	1574	2499	-	2485	=	14	*	(58	/	150)	=	5.41333332
5	1575	2559	-	2528	=	31	*	(41	/	150)	=	8.47333332
Step 4	SUM Weighted Distance From Standard to get 2019 Difference From Standard for Lawrence Elementary											20

Last steps

Compute the average

2018	2019	Sum	Average
24	20	44.0	22.0

Compute the Upper Control Limit

Simply compute the standard deviation and multiply by 3 and add to the average: 28.0

Compute the Lower Control Limit

Simply compute the standard deviation and multiply by 3 and subtract from the average: 16.0

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:

	2018	2019
Percent	12%	13%
Data source	2018 data file	2019 data file