Bennett Valley Union Elementary: math

The shaded band is this district'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	94,025	2446.6	− 2436	10.6	× 152 / 587	2.7
4	94,026	2490.8	− 2485	5.8	× 156 / 587	1.5
5	94,029	2521.3	− 2528	−6.7	× 141 / 587	−1.6
6	94,030	2534.5	− 2552	−17.5	× 138 / 587	−4.1
Sum, rounded to a whole point						−1

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	87,284	2468.0	− 2436	32	× 144 / 567	8.1
4	87,286	2488.3	− 2485	3.3	× 139 / 567	0.8
5	87,288	2507.7	− 2528	−20.3	× 144 / 567	−5.2
6	87,290	2554.5	− 2552	2.5	× 140 / 567	0.6
Sum, rounded to a whole point						4

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	89,762	2460.6	− 2436	24.6	× 142 / 554	6.3
4	89,765	2506.4	− 2485	21.4	× 136 / 554	5.3
5	89,767	2534.7	− 2528	6.7	× 139 / 554	1.7
6	89,768	2545.9	− 2552	−6.1	× 137 / 554	−1.5
Sum, rounded to a whole point						12

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	89,978	2469.6	− 2436	33.6	× 135 / 556	8.2
4	89,979	2491.4	− 2485	6.4	× 141 / 556	1.6
5	89,982	2554.4	− 2528	26.4	× 138 / 556	6.6
6	89,983	2544.5	− 2552	−7.5	× 142 / 556	−1.9
Sum, rounded to a whole point						14

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	90,592	2477.1	− 2436	41.1	× 135 / 536	10.4
4	90,593	2504.3	− 2485	19.3	× 130 / 536	4.7
5	90,594	2519.2	− 2528	−8.8	× 133 / 536	−2.2
6	90,595	2551.7	− 2552	−0.3	× 138 / 536	−0.1
Sum, rounded to a whole point						13

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	90,820	2473.4	− 2436	37.4	× 125 / 501	9.3
4	90,821	2484.8	− 2485	−0.2	× 120 / 501	0
5	90,822	2507.0	− 2528	−21	× 130 / 501	−5.4
6	90,823	2523.1	− 2552	−28.9	× 126 / 501	−7.3
Sum, rounded to a whole point						−3

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	90,718	2460.3	− 2436	24.3	× 137 / 506	6.6
4	90,719	2490.7	− 2485	5.7	× 128 / 506	1.4
5	90,720	2506.6	− 2528	−21.4	× 117 / 506	−4.9
6	90,721	2536.3	− 2552	−15.7	× 124 / 506	−3.8
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	90,663	2481.6	− 2436	45.6	× 131 / 499	12
4	90,664	2471.2	− 2485	−13.8	× 134 / 499	−3.7
5	90,665	2518.4	− 2528	−9.6	× 117 / 499	−2.3
6	90,666	2532.6	− 2552	−19.4	× 117 / 499	−4.5
Sum, rounded to a whole point						1

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	90,357	2460.1	− 2436	24.1	× 126 / 482	6.3
4	90,358	2489.9	− 2485	4.9	× 122 / 482	1.2
5	90,359	2503.5	− 2528	−24.5	× 122 / 482	−6.2
6	90,360	2538.8	− 2552	−13.2	× 112 / 482	−3.1
Sum, rounded to a whole point						−2

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. −1, 4, 12, 14, 13, −3, −1, 1, −2 → 4.1
Typical year-to-year change: how far the result moved from each year to the next, ignoring up or down. 2015→2016: 5 · 2016→2017: 8 · 2017→2018: 2 · 2018→2019: 1 · 2019→2022: 16 · 2022→2023: 2 · 2023→2024: 2 · 2024→2025: 3 → average 4.9
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 4.9 × 2.66 = 13. Upper limit 17.1, lower limit −8.9.

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 — for a district, the total across its schools. From 2014–15, 2015–16, 2016–17, 2017–18, 2018–19, 2020–21, 2021–22, 2022–23, 2023–24, 2024–25, 2025–26.