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
4	68805	2429	-	2485	=	-56	*	(66	/	736)	=	-5.02173913
5	68806	2453	-	2528	=	-75	*	(70	/	736)	=	-7.13315213
6	68809	2474	-	2552	=	-78	*	(95	/	736)	=	-10.06793471
7	68810	2490	-	2567	=	-77	*	(269	/	736)	=	-28.14266301
8	68812	2508	-	2586	=	-78	*	(236	/	736)	=	-25.01086949
Step 4	SUM Weighted Distance From Standard to get 2017 Difference From Standard for Spring Valley Academy											-75

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
4	68959	2426	-	2485	=	-59	*	(57	/	784)	=	-4.28954078
5	68962	2464	-	2528	=	-64	*	(86	/	784)	=	-7.02040813
6	68963	2484	-	2552	=	-68	*	(98	/	784)	=	-8.5
7	68966	2472	-	2567	=	-95	*	(280	/	784)	=	-33.92857142
8	68967	2500	-	2586	=	-86	*	(263	/	784)	=	-28.84948974
Step 4	SUM Weighted Distance From Standard to get 2018 Difference From Standard for Spring Valley Academy											-83

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
4	69499	2439	-	2485	=	-46	*	(45	/	757)	=	-2.73447819
5	69500	2435	-	2528	=	-93	*	(60	/	757)	=	-7.37120204
6	69501	2484	-	2552	=	-68	*	(99	/	757)	=	-8.89299866
7	69502	2475	-	2567	=	-92	*	(270	/	757)	=	-32.81373844
8	69503	2484	-	2586	=	-102	*	(283	/	757)	=	-38.13210034
Step 4	SUM Weighted Distance From Standard to get 2019 Difference From Standard for Spring Valley Academy											-90

Last steps

Compute the average

2017	2018	2019	Sum	Average
-75	-83	-90	-248.0	-82.7

Compute the Upper Control Limit

Simply compute the standard deviation and multiply by 3 and add to the average: -61.666666666666666667

Compute the Lower Control Limit

Simply compute the standard deviation and multiply by 3 and subtract from the average: -103.666666666666666667

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:

	2017	2018	2019
Percent	73%	77%	76%
Data source	2017 data file	2018 data file	2019 data file