Boulder Creek 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	90,980	2424.1	− 2432	−7.9	× 112 / 584	−1.5
4	90,981	2459.2	− 2473	−13.8	× 98 / 584	−2.3
5	90,984	2489.3	− 2502	−12.7	× 105 / 584	−2.3
6	90,985	2542.8	− 2531	11.8	× 84 / 584	1.7
7	90,988	2565.0	− 2552	13	× 93 / 584	2.1
8	90,989	2592.2	− 2567	25.2	× 92 / 584	4
Sum, rounded to a whole point						2

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	84,462	2423.6	− 2432	−8.4	× 113 / 604	−1.6
4	84,463	2476.6	− 2473	3.6	× 117 / 604	0.7
5	84,466	2515.3	− 2502	13.3	× 98 / 604	2.2
6	84,468	2526.0	− 2531	−5	× 90 / 604	−0.7
7	84,469	2584.3	− 2552	32.3	× 93 / 604	5
8	84,472	2588.2	− 2567	21.2	× 93 / 604	3.3
Sum, rounded to a whole point						9

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	86,827	2424.7	− 2432	−7.3	× 121 / 602	−1.5
4	86,829	2475.1	− 2473	2.1	× 102 / 602	0.4
5	86,832	2509.9	− 2502	7.9	× 112 / 602	1.5
6	86,834	2533.8	− 2531	2.8	× 93 / 602	0.4
7	86,836	2554.5	− 2552	2.5	× 89 / 602	0.4
8	86,837	2596.1	− 2567	29.1	× 85 / 602	4.1
Sum, rounded to a whole point						5

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	87,096	2449.2	− 2432	17.2	× 121 / 617	3.4
4	87,097	2480.9	− 2473	7.9	× 118 / 617	1.5
5	87,100	2510.2	− 2502	8.2	× 106 / 617	1.4
6	87,102	2541.3	− 2531	10.3	× 93 / 617	1.6
7	87,103	2556.1	− 2552	4.1	× 87 / 617	0.6
8	87,106	2574.6	− 2567	7.6	× 92 / 617	1.1
Sum, rounded to a whole point						10

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	87,709	2442.6	− 2432	10.6	× 112 / 607	2
4	87,710	2477.8	− 2473	4.8	× 119 / 607	0.9
5	87,711	2524.6	− 2502	22.6	× 116 / 607	4.3
6	87,712	2555.7	− 2531	24.7	× 81 / 607	3.3
7	87,713	2537.0	− 2552	−15	× 97 / 607	−2.4
8	87,714	2553.1	− 2567	−13.9	× 82 / 607	−1.9
Sum, rounded to a whole point						6

2021 from sb_ca2021_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	85,973	2407.8	− 2432	−24.2	× 93 / 536	−4.2
4	85,974	2450.0	− 2473	−23	× 87 / 536	−3.7
5	85,975	2510.1	− 2502	8.1	× 96 / 536	1.5
6	85,976	2513.2	− 2531	−17.8	× 101 / 536	−3.4
7	85,977	2577.9	− 2552	25.9	× 88 / 536	4.3
8	85,978	2548.7	− 2567	−18.3	× 71 / 536	−2.4
Sum, rounded to a whole point						−8

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	88,056	2413.0	− 2432	−19	× 83 / 549	−2.9
4	88,057	2445.5	− 2473	−27.5	× 96 / 549	−4.8
5	88,058	2523.1	− 2502	21.1	× 91 / 549	3.5
6	88,059	2533.2	− 2531	2.2	× 94 / 549	0.4
7	88,060	2533.2	− 2552	−18.8	× 93 / 549	−3.2
8	88,061	2583.2	− 2567	16.2	× 92 / 549	2.7
Sum, rounded to a whole point						−4

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	87,963	2411.5	− 2432	−20.5	× 89 / 528	−3.5
4	87,964	2458.7	− 2473	−14.3	× 81 / 528	−2.2
5	87,965	2499.9	− 2502	−2.1	× 91 / 528	−0.4
6	87,966	2549.8	− 2531	18.8	× 80 / 528	2.8
7	87,967	2556.1	− 2552	4.1	× 97 / 528	0.8
8	87,968	2554.0	− 2567	−13	× 90 / 528	−2.2
Sum, rounded to a whole point						−5

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	87,948	2443.9	− 2432	11.9	× 87 / 532	1.9
4	87,949	2461.9	− 2473	−11.1	× 91 / 532	−1.9
5	87,950	2526.3	− 2502	24.3	× 86 / 532	3.9
6	87,951	2517.9	− 2531	−13.1	× 92 / 532	−2.3
7	87,952	2586.3	− 2552	34.3	× 78 / 532	5
8	87,953	2589.3	− 2567	22.3	× 98 / 532	4.1
Sum, rounded to a whole point						11

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	87,640	2441.7	− 2432	9.7	× 81 / 517	1.5
4	87,641	2471.7	− 2473	−1.3	× 89 / 517	−0.2
5	87,642	2531.5	− 2502	29.5	× 89 / 517	5.1
6	87,643	2531.1	− 2531	0.1	× 90 / 517	0
7	87,644	2551.9	− 2552	−0.1	× 92 / 517	0
8	87,645	2581.9	− 2567	14.9	× 76 / 517	2.2
Sum, rounded to a whole point						9

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. 2, 9, 5, 10, 6, −8, −4, −5, 11, 9 → 3.5
Typical year-to-year change: how far the result moved from each year to the next, ignoring up or down. 2015→2016: 7 · 2016→2017: 4 · 2017→2018: 5 · 2018→2019: 4 · 2019→2021: 14 · 2021→2022: 4 · 2022→2023: 1 · 2023→2024: 16 · 2024→2025: 2 → average 6.3
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 6.3 × 2.66 = 16.8. Upper limit 20.3, lower limit −13.3.

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.