Sutterville 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	61,783	2420.7	− 2436	−15.3	× 103 / 385	−4.1
4	61,784	2459.3	− 2485	−25.7	× 91 / 385	−6.1
5	61,787	2484.1	− 2528	−43.9	× 95 / 385	−10.8
6	61,788	2533.5	− 2552	−18.5	× 96 / 385	−4.6
Sum, rounded to a whole point						−26

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	57,344	2446.8	− 2436	10.8	× 83 / 362	2.5
4	57,346	2449.2	− 2485	−35.8	× 95 / 362	−9.4
5	57,347	2486.9	− 2528	−41.1	× 89 / 362	−10.1
6	57,349	2518.1	− 2552	−33.9	× 95 / 362	−8.9
Sum, rounded to a whole point						−26

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	59,019	2446.0	− 2436	10	× 52 / 326	1.6
4	59,020	2470.6	− 2485	−14.4	× 89 / 326	−3.9
5	59,023	2485.2	− 2528	−42.8	× 91 / 326	−11.9
6	59,024	2526.5	− 2552	−25.5	× 94 / 326	−7.4
Sum, rounded to a whole point						−22

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	59,133	2433.0	− 2436	−3	× 67 / 296	−0.7
4	59,136	2456.0	− 2485	−29	× 59 / 296	−5.8
5	59,137	2501.3	− 2528	−26.7	× 83 / 296	−7.5
6	59,140	2510.7	− 2552	−41.3	× 87 / 296	−12.1
Sum, rounded to a whole point						−26

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	59,389	2466.7	− 2436	30.7	× 69 / 292	7.3
4	59,390	2468.8	− 2485	−16.2	× 78 / 292	−4.3
5	59,391	2467.6	− 2528	−60.4	× 55 / 292	−11.4
6	59,392	2545.9	− 2552	−6.1	× 90 / 292	−1.9
Sum, rounded to a whole point						−10

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	59,472	2467.8	− 2436	31.8	× 65 / 239	8.6
4	59,473	2511.5	− 2485	26.5	× 64 / 239	7.1
5	59,474	2524.2	− 2528	−3.8	× 55 / 239	−0.9
6	59,475	2561.6	− 2552	9.6	× 55 / 239	2.2
Sum, rounded to a whole point						17

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	59,430	2461.4	− 2436	25.4	× 60 / 244	6.2
4	59,431	2496.7	− 2485	11.7	× 64 / 244	3.1
5	59,432	2542.7	− 2528	14.7	× 64 / 244	3.9
6	59,433	2569.2	− 2552	17.2	× 56 / 244	3.9
Sum, rounded to a whole point						17

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	59,361	2471.1	− 2436	35.1	× 55 / 244	7.9
4	59,362	2476.0	− 2485	−9	× 65 / 244	−2.4
5	59,363	2524.3	− 2528	−3.7	× 63 / 244	−1
6	59,364	2581.6	− 2552	29.6	× 61 / 244	7.4
Sum, rounded to a whole point						12

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	59,118	2476.3	− 2436	40.3	× 52 / 238	8.8
4	59,119	2495.7	− 2485	10.7	× 57 / 238	2.6
5	59,120	2497.7	− 2528	−30.3	× 68 / 238	−8.7
6	59,121	2578.6	− 2552	26.6	× 61 / 238	6.8
Sum, rounded to a whole point						10

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. −26, −26, −22, −26, −10, 17, 17, 12, 10 → −6
Typical year-to-year change: how far the result moved from each year to the next, ignoring up or down. 2015→2016: 0 · 2016→2017: 4 · 2017→2018: 4 · 2018→2019: 16 · 2019→2022: 27 · 2022→2023: 0 · 2023→2024: 5 · 2024→2025: 2 → 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 13.4, lower limit −25.4.

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.