Mitchell Community 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	37,678	2418.3	− 2436	−17.7	× 80 / 353	−4
4	37,680	2461.8	− 2485	−23.2	× 87 / 353	−5.7
5	37,682	2515.6	− 2528	−12.4	× 88 / 353	−3.1
6	37,684	2523.0	− 2552	−29	× 98 / 353	−8.1
Sum, rounded to a whole point						−21

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	35,036	2430.8	− 2436	−5.2	× 79 / 343	−1.2
4	35,039	2467.3	− 2485	−17.7	× 88 / 343	−4.5
5	35,040	2489.3	− 2528	−38.7	× 85 / 343	−9.6
6	35,042	2566.6	− 2552	14.6	× 91 / 343	3.9
Sum, rounded to a whole point						−11

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	35,705	2444.2	− 2436	8.2	× 93 / 345	2.2
4	35,706	2473.8	− 2485	−11.2	× 83 / 345	−2.7
5	35,708	2519.0	− 2528	−9	× 89 / 345	−2.3
6	35,710	2528.3	− 2552	−23.7	× 80 / 345	−5.5
Sum, rounded to a whole point						−8

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	35,714	2414.4	− 2436	−21.6	× 108 / 386	−6
4	35,716	2483.4	− 2485	−1.6	× 96 / 386	−0.4
5	35,718	2508.0	− 2528	−20	× 89 / 386	−4.6
6	35,720	2538.8	− 2552	−13.2	× 93 / 386	−3.2
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	35,884	2445.5	− 2436	9.5	× 92 / 369	2.4
4	35,885	2477.1	− 2485	−7.9	× 98 / 369	−2.1
5	35,886	2503.1	− 2528	−24.9	× 84 / 369	−5.7
6	35,887	2524.1	− 2552	−27.9	× 95 / 369	−7.2
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	35,769	2401.9	− 2436	−34.1	× 74 / 321	−7.9
4	35,770	2450.8	− 2485	−34.2	× 70 / 321	−7.5
5	35,771	2485.8	− 2528	−42.2	× 84 / 321	−11
6	35,772	2512.8	− 2552	−39.2	× 93 / 321	−11.4
Sum, rounded to a whole point						−38

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	35,780	2404.6	− 2436	−31.4	× 85 / 318	−8.4
4	35,781	2458.9	− 2485	−26.1	× 77 / 318	−6.3
5	35,782	2479.7	− 2528	−48.3	× 75 / 318	−11.4
6	35,783	2489.4	− 2552	−62.6	× 81 / 318	−15.9
Sum, rounded to a whole point						−42

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	35,636	2396.6	− 2436	−39.4	× 75 / 326	−9.1
4	35,637	2447.9	− 2485	−37.1	× 98 / 326	−11.2
5	35,638	2487.9	− 2528	−40.1	× 72 / 326	−8.9
6	35,639	2490.2	− 2552	−61.8	× 81 / 326	−15.4
Sum, rounded to a whole point						−44

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	35,479	2416.7	− 2436	−19.3	× 85 / 325	−5
4	35,480	2445.5	− 2485	−39.5	× 74 / 325	−9
5	35,481	2466.2	− 2528	−61.8	× 91 / 325	−17.3
6	35,482	2526.1	− 2552	−25.9	× 75 / 325	−6
Sum, rounded to a whole point						−37

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. −21, −11, −8, −14, −13, −38, −42, −44, −37 → −25.3
Typical year-to-year change: how far the result moved from each year to the next, ignoring up or down. 2015→2016: 10 · 2016→2017: 3 · 2017→2018: 6 · 2018→2019: 1 · 2019→2022: 25 · 2022→2023: 4 · 2023→2024: 2 · 2024→2025: 7 → average 7.3
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 7.3 × 2.66 = 19.4. Upper limit −5.9, lower limit −44.7.

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.