Northwest Prep Charter: math

The shaded band is this school's normal range. If nothing about how it works changes, nearly every future year should land inside it. Zero means the typical student just meets the state standard. The small numbers under the years are how many students were tested.

Step 1 · Each year's result

For each grade tested, take the average (mean) scale score from the California Department of Education's results file, and subtract the lowest score that counts as "Standard Met" for that grade. That is the grade's distance from standard. Weight each grade by its share of the students tested, then add the grades up. Grades where the state hides the average because ten or fewer students tested are left out entirely.

2015 from sb_ca2015_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
7	94,875	2504.7	− 2567	−62.3	× 11 / 34	−20.2
8	94,876	2506.8	− 2586	−79.2	× 11 / 34	−25.6
11	94,879	2460.8	− 2628	−167.2	× 12 / 34	−59
Sum, rounded to a whole point						−105

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
7	88,106	2475.9	− 2567	−91.1	× 21 / 47	−40.7
8	88,108	2533.3	− 2586	−52.7	× 14 / 47	−15.7
11	88,110	2525.2	− 2628	−102.8	× 12 / 47	−26.2
Sum, rounded to a whole point						−83

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
7	90,654	2522.2	− 2567	−44.8	× 17 / 57	−13.4
8	90,656	2480.3	− 2586	−105.7	× 22 / 57	−40.8
11	90,659	2537.8	− 2628	−90.2	× 18 / 57	−28.5
Sum, rounded to a whole point						−83

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
7	90,860	2488.6	− 2567	−78.4	× 15 / 50	−23.5
8	90,861	2470.0	− 2586	−116	× 17 / 50	−39.4
11	90,864	2510.0	− 2628	−118	× 18 / 50	−42.5
Sum, rounded to a whole point						−105

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
7	91,493	2465.9	− 2567	−101.1	× 24 / 58	−41.8
8	91,494	2484.5	− 2586	−101.5	× 18 / 58	−31.5
11	91,495	2510.1	− 2628	−117.9	× 16 / 58	−32.5
Sum, rounded to a whole point						−106

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
11	91,745	2528.1	− 2628	−99.9	× 16 / 16	−99.9
Sum, rounded to a whole point						−100

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
7	91,637	2464.0	− 2567	−103	× 29 / 60	−49.8
8	91,638	2473.4	− 2586	−112.6	× 17 / 60	−31.9
11	91,639	2512.6	− 2628	−115.4	× 14 / 60	−26.9
Sum, rounded to a whole point						−109

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
7	91,580	2460.5	− 2567	−106.5	× 22 / 81	−28.9
8	91,581	2461.2	− 2586	−124.8	× 32 / 81	−49.3
11	91,582	2515.6	− 2628	−112.4	× 27 / 81	−37.5
Sum, rounded to a whole point						−116

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
7	91,282	2476.1	− 2567	−90.9	× 17 / 56	−27.6
8	91,283	2466.1	− 2586	−119.9	× 25 / 56	−53.5
11	91,284	2544.4	− 2628	−83.6	× 14 / 56	−20.9
Sum, rounded to a whole point						−102

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. −105, −83, −83, −105, −106, −100, −109, −116, −102 → −101
Typical year-to-year change: how far the result moved from each year to the next, ignoring up or down. 2015→2016: 22 · 2016→2017: 0 · 2017→2018: 22 · 2018→2019: 1 · 2019→2022: 6 · 2022→2023: 9 · 2023→2024: 7 · 2024→2025: 14 → average 10.1
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 10.1 × 2.66 = 26.9. Upper limit −74.1, lower limit −127.9.

Why 2.66? It is the standard factor from quality control, the work of Walter Shewhart and W. Edwards Deming. It turns "how much the result typically changes in a year" into "how far it can wander by chance alone".

Years with no result (no state tests were given in spring 2020) are skipped: the year-to-year change runs from the last year with a result to the next one.

Step 3 · Free or reduced-price meals

The share of enrolled students eligible for free or reduced-price meals. From 2014–15, 2015–16, 2016–17, 2017–18, 2018–19, 2020–21, 2021–22, 2022–23, 2023–24, 2024–25, 2025–26.