Donn B. Chenoweth Elementary: 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
3	44,385	2424.2	− 2432	−7.8	× 146 / 380	−3
4	44,388	2458.3	− 2473	−14.7	× 113 / 380	−4.4
5	44,389	2490.4	− 2502	−11.6	× 121 / 380	−3.7
Sum, rounded to a whole point						−11

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	41,101	2439.1	− 2432	7.1	× 123 / 454	1.9
4	41,103	2462.9	− 2473	−10.1	× 132 / 454	−2.9
5	41,105	2528.4	− 2502	26.4	× 99 / 454	5.8
6	41,107	2534.9	− 2531	3.9	× 100 / 454	0.9
Sum, rounded to a whole point						6

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	42,126	2437.0	− 2432	5	× 104 / 455	1.1
4	42,129	2471.9	− 2473	−1.1	× 128 / 455	−0.3
5	42,131	2497.7	− 2502	−4.3	× 126 / 455	−1.2
6	42,132	2536.6	− 2531	5.6	× 97 / 455	1.2
Sum, rounded to a whole point						1

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	42,139	2449.1	− 2432	17.1	× 98 / 449	3.7
4	42,142	2479.4	− 2473	6.4	× 101 / 449	1.4
5	42,143	2509.8	− 2502	7.8	× 127 / 449	2.2
6	42,146	2531.0	− 2531	0	× 123 / 449	0
Sum, rounded to a whole point						7

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	42,277	2461.2	− 2432	29.2	× 94 / 428	6.4
4	42,278	2491.6	− 2473	18.6	× 99 / 428	4.3
5	42,279	2495.0	− 2502	−7	× 108 / 428	−1.8
6	42,280	2552.5	− 2531	21.5	× 127 / 428	6.4
Sum, rounded to a whole point						15

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	42,038	2417.5	− 2432	−14.5	× 89 / 378	−3.4
4	42,039	2466.1	− 2473	−6.9	× 99 / 378	−1.8
5	42,040	2505.8	− 2502	3.8	× 95 / 378	1
6	42,041	2526.4	− 2531	−4.6	× 95 / 378	−1.2
Sum, rounded to a whole point						−5

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	42,063	2408.4	− 2432	−23.6	× 100 / 403	−5.9
4	42,064	2441.5	− 2473	−31.5	× 101 / 403	−7.9
5	42,065	2516.3	− 2502	14.3	× 103 / 403	3.7
6	42,066	2536.7	− 2531	5.7	× 99 / 403	1.4
Sum, rounded to a whole point						−9

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	41,894	2426.7	− 2432	−5.3	× 99 / 405	−1.3
4	41,895	2445.2	− 2473	−27.8	× 101 / 405	−6.9
5	41,896	2476.0	− 2502	−26	× 101 / 405	−6.5
6	41,897	2535.9	− 2531	4.9	× 104 / 405	1.3
Sum, rounded to a whole point						−13

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	41,657	2433.3	− 2432	1.3	× 95 / 391	0.3
4	41,658	2455.9	− 2473	−17.1	× 97 / 391	−4.2
5	41,659	2472.8	− 2502	−29.2	× 101 / 391	−7.5
6	41,660	2517.6	− 2531	−13.4	× 98 / 391	−3.4
Sum, rounded to a whole point						−15

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. −11, 6, 1, 7, 15, −5, −9, −13, −15 → −2.7
Typical year-to-year change: how far the result moved from each year to the next, ignoring up or down. 2015→2016: 17 · 2016→2017: 5 · 2017→2018: 6 · 2018→2019: 8 · 2019→2022: 20 · 2022→2023: 4 · 2023→2024: 4 · 2024→2025: 2 → average 8.3
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 8.3 × 2.66 = 22.1. Upper limit 19.4, lower limit −24.8.

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, 2025–26.