Robert Louis Stevenson College And Career Preparat: 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
6	33,122	2445.5	− 2552	−106.5	× 363 / 1554	−24.9
7	33,124	2473.5	− 2567	−93.5	× 613 / 1554	−36.9
8	33,126	2478.6	− 2586	−107.4	× 578 / 1554	−39.9
Sum, rounded to a whole point						−102

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
6	31,335	2449.1	− 2552	−102.9	× 402 / 1475	−28
7	31,338	2473.8	− 2567	−93.2	× 449 / 1475	−28.4
8	31,340	2488.6	− 2586	−97.4	× 624 / 1475	−41.2
Sum, rounded to a whole point						−98

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
6	31,896	2452.0	− 2552	−100	× 363 / 1260	−28.8
7	31,898	2477.6	− 2567	−89.4	× 463 / 1260	−32.9
8	31,900	2486.1	− 2586	−99.9	× 434 / 1260	−34.4
Sum, rounded to a whole point						−96

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
6	31,933	2463.4	− 2552	−88.6	× 329 / 1180	−24.7
7	31,936	2476.3	− 2567	−90.7	× 405 / 1180	−31.1
8	31,937	2467.9	− 2586	−118.1	× 446 / 1180	−44.6
Sum, rounded to a whole point						−100

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
6	32,111	2461.2	− 2552	−90.8	× 324 / 1114	−26.4
7	32,112	2479.8	− 2567	−87.2	× 399 / 1114	−31.2
8	32,113	2485.3	− 2586	−100.7	× 391 / 1114	−35.3
Sum, rounded to a whole point						−93

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
6	32,138	2436.4	− 2552	−115.6	× 268 / 847	−36.6
7	32,139	2463.6	− 2567	−103.4	× 263 / 847	−32.1
8	32,140	2458.9	− 2586	−127.1	× 316 / 847	−47.4
Sum, rounded to a whole point						−116

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
6	32,197	2440.2	− 2552	−111.8	× 261 / 831	−35.1
7	32,198	2457.6	− 2567	−109.4	× 299 / 831	−39.4
8	32,199	2478.9	− 2586	−107.1	× 271 / 831	−34.9
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
6	32,063	2476.6	− 2552	−75.4	× 202 / 768	−19.8
7	32,064	2460.6	− 2567	−106.4	× 278 / 768	−38.5
8	32,065	2473.2	− 2586	−112.8	× 288 / 768	−42.3
Sum, rounded to a whole point						−101

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
6	31,922	2438.9	− 2552	−113.1	× 242 / 765	−35.8
7	31,923	2475.6	− 2567	−91.4	× 233 / 765	−27.8
8	31,924	2485.0	− 2586	−101	× 290 / 765	−38.3
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. −102, −98, −96, −100, −93, −116, −109, −101, −102 → −101.9
Typical year-to-year change: how far the result moved from each year to the next, ignoring up or down. 2015→2016: 4 · 2016→2017: 2 · 2017→2018: 4 · 2018→2019: 7 · 2019→2022: 23 · 2022→2023: 7 · 2023→2024: 8 · 2024→2025: 1 → average 7
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 7 × 2.66 = 18.6. Upper limit −83.3, lower limit −120.5.

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.