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
3	93866	2365	-	2436	=	-71	*	(27	/	88)	=	-21.78409085
4	93867	2406	-	2485	=	-79	*	(33	/	88)	=	-29.625
5	93870	2409	-	2528	=	-119	*	(28	/	88)	=	-37.86363634
Step 4	SUM Weighted Distance From Standard to get 2015 Difference From Standard for Prescott											-89

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
3	2645	2383	-	2436	=	-53	*	(42	/	100)	=	-22.26
4	2647	2393	-	2485	=	-92	*	(28	/	100)	=	-25.76
5	2650	2408	-	2528	=	-120	*	(30	/	100)	=	-36.0
Step 4	SUM Weighted Distance From Standard to get 2016 Difference From Standard for Prescott											-84

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
3	2720	2376	-	2436	=	-60	*	(26	/	90)	=	-17.33333328
4	2722	2414	-	2485	=	-71	*	(37	/	90)	=	-29.18888888
5	2724	2439	-	2528	=	-89	*	(27	/	90)	=	-26.7
Step 4	SUM Weighted Distance From Standard to get 2017 Difference From Standard for Prescott											-73

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	2724	2354	-	2436	=	-82	*	(29	/	77)	=	-30.88311683
4	2725	2394	-	2485	=	-91	*	(19	/	77)	=	-22.45454539
5	2728	2443	-	2528	=	-85	*	(29	/	77)	=	-32.01298696
Step 4	SUM Weighted Distance From Standard to get 2018 Difference From Standard for Prescott											-85

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	2745	2350	-	2436	=	-86	*	(17	/	62)	=	-23.58064513
4	2746	2415	-	2485	=	-70	*	(28	/	62)	=	-31.61290321
5	2747	2496	-	2528	=	-32	*	(17	/	62)	=	-8.77419354
Step 4	SUM Weighted Distance From Standard to get 2019 Difference From Standard for Prescott											-64

Last steps

Compute the average

2015	2016	2017	2018	2019	Sum	Average
-89	-84	-73	-85	-64	-395.0	-79.0

Compute the Upper Control Limit

Simply compute the standard deviation and multiply by 3 and add to the average: -49.0

Compute the Lower Control Limit

Simply compute the standard deviation and multiply by 3 and subtract from the average: -109.0

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:

	2015	2016	2017	2018	2019
Percent	87%	93%	89%	90%	91%
Data source	2015 data file	2016 data file	2017 data file	2018 data file	2019 data file