Horizons School: Independent Study: english

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	6,748	2642.4	− 2583	59.4	× 17 / 17	59.4
Sum, rounded to a whole point						59

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
11	6,079	2605.2	− 2583	22.2	× 35 / 35	22.2
Sum, rounded to a whole point						22

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
11	6,254	2620.4	− 2583	37.4	× 35 / 35	37.4
Sum, rounded to a whole point						37

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
11	6,250	2617.1	− 2583	34.1	× 47 / 47	34.1
Sum, rounded to a whole point						34

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
11	6,308	2630.7	− 2583	47.7	× 43 / 43	47.7
Sum, rounded to a whole point						48

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	6,221	2441.0	− 2432	9	× 39 / 141	2.5
4	6,222	2449.9	− 2473	−23.1	× 32 / 141	−5.2
5	6,223	2501.8	− 2502	−0.2	× 39 / 141	−0.1
6	6,224	2503.9	− 2531	−27.1	× 11 / 141	−2.1
11	6,227	2618.2	− 2583	35.2	× 20 / 141	5
Sum, rounded to a whole point						0

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	6,205	2452.2	− 2432	20.2	× 25 / 145	3.5
4	6,206	2437.5	− 2473	−35.5	× 13 / 145	−3.2
5	6,207	2497.5	− 2502	−4.5	× 11 / 145	−0.3
6	6,208	2496.1	− 2531	−34.9	× 23 / 145	−5.5
7	6,209	2562.0	− 2552	10	× 24 / 145	1.7
8	6,210	2549.1	− 2567	−17.9	× 14 / 145	−1.7
11	6,211	2608.9	− 2583	25.9	× 35 / 145	6.3
Sum, rounded to a whole point						1

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	6,140	2370.6	− 2432	−61.4	× 11 / 103	−6.6
4	6,141	2443.8	− 2473	−29.2	× 12 / 103	−3.4
6	6,143	2470.1	− 2531	−60.9	× 21 / 103	−12.4
7	6,144	2521.0	− 2552	−31	× 17 / 103	−5.1
8	6,145	2511.9	− 2567	−55.1	× 21 / 103	−11.2
11	6,146	2587.5	− 2583	4.5	× 21 / 103	0.9
Sum, rounded to a whole point						−38

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
4	6,107	2473.4	− 2473	0.4	× 11 / 94	0
6	6,109	2479.5	− 2531	−51.5	× 17 / 94	−9.3
7	6,110	2555.1	− 2552	3.1	× 16 / 94	0.5
8	6,111	2565.2	− 2567	−1.8	× 19 / 94	−0.4
11	6,112	2588.5	− 2583	5.5	× 31 / 94	1.8
Sum, rounded to a whole point						−7

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. 59, 22, 37, 34, 48, 0, 1, −38, −7 → 17.3
Typical year-to-year change: how far the result moved from each year to the next, ignoring up or down. 2015→2016: 37 · 2016→2017: 15 · 2017→2018: 3 · 2018→2019: 14 · 2019→2022: 48 · 2022→2023: 1 · 2023→2024: 39 · 2024→2025: 31 → average 23.5
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 23.5 × 2.66 = 62.5. Upper limit 79.8, lower limit −45.2.

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.