Bautista Creek Elementary: 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
3	56,625	2413.3	− 2436	−22.7	× 126 / 428	−6.7
4	56,626	2460.7	− 2485	−24.3	× 142 / 428	−8.1
5	56,629	2479.5	− 2528	−48.5	× 160 / 428	−18.1
Sum, rounded to a whole point						−33

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	52,605	2408.7	− 2436	−27.3	× 165 / 446	−10.1
4	52,607	2448.9	− 2485	−36.1	× 137 / 446	−11.1
5	52,609	2503.2	− 2528	−24.8	× 144 / 446	−8
Sum, rounded to a whole point						−29

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	54,114	2418.7	− 2436	−17.3	× 135 / 444	−5.3
4	54,117	2440.9	− 2485	−44.1	× 157 / 444	−15.6
5	54,119	2482.8	− 2528	−45.2	× 152 / 444	−15.5
Sum, rounded to a whole point						−36

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	54,223	2405.7	− 2436	−30.3	× 160 / 474	−10.2
4	54,225	2454.1	− 2485	−30.9	× 144 / 474	−9.4
5	54,227	2468.1	− 2528	−59.9	× 170 / 474	−21.5
Sum, rounded to a whole point						−41

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	54,462	2411.2	− 2436	−24.8	× 156 / 459	−8.4
4	54,463	2445.7	− 2485	−39.3	× 150 / 459	−12.8
5	54,464	2496.5	− 2528	−31.5	× 153 / 459	−10.5
Sum, rounded to a whole point						−32

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	54,508	2396.1	− 2436	−39.9	× 164 / 462	−14.2
4	54,509	2415.7	− 2485	−69.3	× 162 / 462	−24.3
5	54,510	2436.9	− 2528	−91.1	× 136 / 462	−26.8
Sum, rounded to a whole point						−65

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	54,457	2381.2	− 2436	−54.8	× 163 / 503	−17.8
4	54,458	2418.0	− 2485	−67	× 169 / 503	−22.5
5	54,459	2421.7	− 2528	−106.3	× 171 / 503	−36.1
Sum, rounded to a whole point						−76

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	54,329	2375.0	− 2436	−61	× 142 / 484	−17.9
4	54,330	2418.5	− 2485	−66.5	× 170 / 484	−23.4
5	54,331	2434.5	− 2528	−93.5	× 172 / 484	−33.2
Sum, rounded to a whole point						−74

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	54,067	2403.0	− 2436	−33	× 159 / 472	−11.1
4	54,068	2396.6	− 2485	−88.4	× 144 / 472	−27
5	54,069	2434.8	− 2528	−93.2	× 169 / 472	−33.4
Sum, rounded to a whole point						−71

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. −33, −29, −36, −41, −32, −65, −76, −74, −71 → −50.8
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: 7 · 2017→2018: 5 · 2018→2019: 9 · 2019→2022: 33 · 2022→2023: 11 · 2023→2024: 2 · 2024→2025: 3 → average 9.3
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 9.3 × 2.66 = 24.7. Upper limit −26.1, lower limit −75.5.

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.