Cook (Hazel Goes) 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	70,627	2397.2	− 2436	−38.8	× 50 / 255	−7.6
4	70,628	2472.5	− 2485	−12.5	× 61 / 255	−3
5	70,631	2471.4	− 2528	−56.6	× 69 / 255	−15.3
6	70,632	2527.3	− 2552	−24.7	× 75 / 255	−7.3
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	65,455	2440.2	− 2436	4.2	× 50 / 245	0.9
4	65,457	2473.8	− 2485	−11.2	× 51 / 245	−2.3
5	65,460	2482.6	− 2528	−45.4	× 68 / 245	−12.6
6	65,461	2505.4	− 2552	−46.6	× 76 / 245	−14.5
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	67,272	2414.4	− 2436	−21.6	× 44 / 198	−4.8
4	67,274	2494.3	− 2485	9.3	× 50 / 198	2.3
5	67,276	2508.0	− 2528	−20	× 46 / 198	−4.6
6	67,277	2556.7	− 2552	4.7	× 58 / 198	1.4
Sum, rounded to a whole point						−6

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	67,377	2417.6	− 2436	−18.4	× 40 / 194	−3.8
4	67,379	2474.8	− 2485	−10.2	× 48 / 194	−2.5
5	67,381	2520.1	− 2528	−7.9	× 53 / 194	−2.2
6	67,383	2556.2	− 2552	4.2	× 53 / 194	1.1
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	67,893	2420.6	− 2436	−15.4	× 58 / 208	−4.3
4	67,894	2465.6	− 2485	−19.4	× 46 / 208	−4.3
5	67,895	2465.8	− 2528	−62.2	× 52 / 208	−15.6
6	67,896	2541.8	− 2552	−10.2	× 52 / 208	−2.6
Sum, rounded to a whole point						−27

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	68,021	2399.6	− 2436	−36.4	× 51 / 220	−8.4
4	68,022	2450.3	− 2485	−34.7	× 50 / 220	−7.9
5	68,023	2458.1	− 2528	−69.9	× 60 / 220	−19.1
6	68,024	2490.1	− 2552	−61.9	× 59 / 220	−16.6
Sum, rounded to a whole point						−52

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	68,039	2413.6	− 2436	−22.4	× 49 / 224	−4.9
4	68,040	2469.7	− 2485	−15.3	× 56 / 224	−3.8
5	68,041	2477.4	− 2528	−50.6	× 57 / 224	−12.9
6	68,042	2498.0	− 2552	−54	× 62 / 224	−14.9
Sum, rounded to a whole point						−37

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	68,033	2392.2	− 2436	−43.8	× 38 / 199	−8.4
4	68,034	2461.8	− 2485	−23.2	× 54 / 199	−6.3
5	68,035	2490.5	− 2528	−37.5	× 54 / 199	−10.2
6	68,036	2513.1	− 2552	−38.9	× 53 / 199	−10.4
Sum, rounded to a whole point						−35

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	67,801	2398.8	− 2436	−37.2	× 52 / 201	−9.6
4	67,802	2436.1	− 2485	−48.9	× 43 / 201	−10.5
5	67,803	2492.4	− 2528	−35.6	× 52 / 201	−9.2
6	67,804	2522.4	− 2552	−29.6	× 54 / 201	−8
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. −33, −29, −6, −7, −27, −52, −37, −35, −37 → −29.2
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: 23 · 2017→2018: 1 · 2018→2019: 20 · 2019→2022: 25 · 2022→2023: 15 · 2023→2024: 2 · 2024→2025: 2 → average 11.5
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 11.5 × 2.66 = 30.6. Upper limit 1.4, lower limit −59.8.

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.