King-Chavez Preparatory Academy: 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	73,590	2439.8	− 2552	−112.2	× 109 / 336	−36.4
7	73,592	2452.5	− 2567	−114.5	× 114 / 336	−38.8
8	73,594	2480.5	− 2586	−105.5	× 113 / 336	−35.5
Sum, rounded to a whole point						−111

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
6	68,269	2418.3	− 2552	−133.7	× 118 / 356	−44.3
7	68,271	2452.2	− 2567	−114.8	× 116 / 356	−37.4
8	68,273	2446.5	− 2586	−139.5	× 122 / 356	−47.8
Sum, rounded to a whole point						−130

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
6	70,085	2443.1	− 2552	−108.9	× 113 / 348	−35.4
7	70,088	2462.1	− 2567	−104.9	× 116 / 348	−35
8	70,090	2484.1	− 2586	−101.9	× 119 / 348	−34.8
Sum, rounded to a whole point						−105

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
6	70,244	2461.4	− 2552	−90.6	× 120 / 357	−30.5
7	70,247	2446.4	− 2567	−120.6	× 118 / 357	−39.9
8	70,248	2482.7	− 2586	−103.3	× 119 / 357	−34.4
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
6	70,760	2450.0	− 2552	−102	× 117 / 349	−34.2
7	70,761	2460.7	− 2567	−106.3	× 118 / 349	−35.9
8	70,762	2468.4	− 2586	−117.6	× 114 / 349	−38.4
Sum, rounded to a whole point						−109

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
6	70,836	2403.9	− 2552	−148.1	× 96 / 286	−49.7
7	70,837	2426.1	− 2567	−140.9	× 94 / 286	−46.3
8	70,838	2471.4	− 2586	−114.6	× 96 / 286	−38.5
Sum, rounded to a whole point						−134

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
6	70,832	2416.3	− 2552	−135.7	× 61 / 240	−34.5
7	70,833	2424.3	− 2567	−142.7	× 93 / 240	−55.3
8	70,834	2437.0	− 2586	−149	× 86 / 240	−53.4
Sum, rounded to a whole point						−143

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
6	70,814	2406.5	− 2552	−145.5	× 71 / 226	−45.7
7	70,815	2439.3	− 2567	−127.7	× 61 / 226	−34.5
8	70,816	2446.6	− 2586	−139.4	× 94 / 226	−58
Sum, rounded to a whole point						−138

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
6	70,528	2413.6	− 2552	−138.4	× 62 / 186	−46.1
7	70,529	2438.5	− 2567	−128.5	× 63 / 186	−43.5
8	70,530	2424.4	− 2586	−161.6	× 61 / 186	−53
Sum, rounded to a whole point						−143

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. −111, −130, −105, −105, −109, −134, −143, −138, −143 → −124.2
Typical year-to-year change: how far the result moved from each year to the next, ignoring up or down. 2015→2016: 19 · 2016→2017: 25 · 2017→2018: 0 · 2018→2019: 4 · 2019→2022: 25 · 2022→2023: 9 · 2023→2024: 5 · 2024→2025: 5 → average 11.5
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 11.5 × 2.66 = 30.6. Upper limit −93.6, lower limit −154.8.

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.