Snowline Academy: 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
4	69,069	2400.0	− 2473	−73	× 11 / 11	−73
Sum, rounded to a whole point						−73

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
11	65,820	2615.4	− 2583	32.4	× 12 / 12	32.4
Sum, rounded to a whole point						32

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
11	65,899	2618.4	− 2583	35.4	× 19 / 19	35.4
Sum, rounded to a whole point						35

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	66,344	2364.0	− 2432	−68	× 17 / 195	−5.9
4	66,345	2396.0	− 2473	−77	× 19 / 195	−7.5
5	66,346	2467.2	− 2502	−34.8	× 17 / 195	−3
6	66,347	2474.4	− 2531	−56.6	× 26 / 195	−7.5
7	66,348	2510.3	− 2552	−41.7	× 41 / 195	−8.8
8	66,349	2499.6	− 2567	−67.4	× 33 / 195	−11.4
11	66,350	2553.8	− 2583	−29.2	× 42 / 195	−6.3
Sum, rounded to a whole point						−50

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	66,344	2419.3	− 2432	−12.7	× 12 / 106	−1.4
6	66,347	2484.6	− 2531	−46.4	× 13 / 106	−5.7
7	66,348	2543.7	− 2552	−8.3	× 23 / 106	−1.8
8	66,349	2554.5	− 2567	−12.5	× 28 / 106	−3.3
11	66,350	2571.2	− 2583	−11.8	× 30 / 106	−3.3
Sum, rounded to a whole point						−16

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
7	66,326	2454.8	− 2552	−97.2	× 16 / 49	−31.7
8	66,327	2584.1	− 2567	17.1	× 17 / 49	5.9
11	66,328	2565.8	− 2583	−17.2	× 16 / 49	−5.6
Sum, rounded to a whole point						−31

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
6	66,081	2512.0	− 2531	−19	× 13 / 39	−6.3
8	66,083	2565.7	− 2567	−1.3	× 15 / 39	−0.5
11	66,084	2562.6	− 2583	−20.4	× 11 / 39	−5.8
Sum, rounded to a whole point						−13

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. −73, 32, 35, −50, −16, −31, −13 → −16.6
Typical year-to-year change: how far the result moved from each year to the next, ignoring up or down. 2015→2017: 105 · 2017→2018: 3 · 2018→2022: 85 · 2022→2023: 34 · 2023→2024: 15 · 2024→2025: 18 → average 43.3
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 43.3 × 2.66 = 115.2. Upper limit 98.6, lower limit −131.8.

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.