Helen Hunt Jackson College Prep High School: 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
11	56,528	2478.6	− 2628	−149.4	× 101 / 101	−149.4
Sum, rounded to a whole point						−149

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
11	52,509	2478.3	− 2628	−149.7	× 113 / 113	−149.7
Sum, rounded to a whole point						−150

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
11	54,004	2489.2	− 2628	−138.8	× 103 / 103	−138.8
Sum, rounded to a whole point						−139

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
11	54,112	2487.8	− 2628	−140.2	× 105 / 105	−140.2
Sum, rounded to a whole point						−140

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
11	54,348	2507.7	− 2628	−120.3	× 95 / 95	−120.3
Sum, rounded to a whole point						−120

2021 from sb_ca2021_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
11	53,123	2506.4	− 2628	−121.6	× 57 / 57	−121.6
Sum, rounded to a whole point						−122

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
11	54,396	2507.3	− 2628	−120.7	× 136 / 136	−120.7
Sum, rounded to a whole point						−121

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
6	54,344	2410.9	− 2552	−141.1	× 76 / 298	−36
7	54,345	2426.6	− 2567	−140.4	× 80 / 298	−37.7
8	54,346	2453.6	− 2586	−132.4	× 68 / 298	−30.2
11	54,347	2479.4	− 2628	−148.6	× 74 / 298	−36.9
Sum, rounded to a whole point						−141

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	54,209	2387.6	− 2436	−48.4	× 42 / 420	−4.8
4	54,210	2400.8	− 2485	−84.2	× 31 / 420	−6.2
5	54,211	2412.7	− 2528	−115.3	× 35 / 420	−9.6
6	54,212	2409.5	− 2552	−142.5	× 71 / 420	−24.1
7	54,213	2439.5	− 2567	−127.5	× 80 / 420	−24.3
8	54,214	2432.2	− 2586	−153.8	× 79 / 420	−28.9
11	54,215	2479.9	− 2628	−148.1	× 82 / 420	−28.9
Sum, rounded to a whole point						−127

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	53,947	2414.6	− 2436	−21.4	× 28 / 362	−1.7
4	53,948	2406.6	− 2485	−78.4	× 23 / 362	−5
5	53,949	2432.2	− 2528	−95.8	× 33 / 362	−8.7
6	53,950	2407.2	− 2552	−144.8	× 52 / 362	−20.8
7	53,951	2462.5	− 2567	−104.5	× 75 / 362	−21.7
8	53,952	2456.4	− 2586	−129.6	× 72 / 362	−25.8
11	53,953	2475.7	− 2628	−152.3	× 79 / 362	−33.2
Sum, rounded to a whole point						−117

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. −149, −150, −139, −140, −120, −122, −121, −141, −127, −117 → −132.6
Typical year-to-year change: how far the result moved from each year to the next, ignoring up or down. 2015→2016: 1 · 2016→2017: 11 · 2017→2018: 1 · 2018→2019: 20 · 2019→2021: 2 · 2021→2022: 1 · 2022→2023: 20 · 2023→2024: 14 · 2024→2025: 10 → average 8.9
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 8.9 × 2.66 = 23.7. Upper limit −108.9, lower limit −156.3.

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.