Foxboro 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	93,304	2412.8	− 2432	−19.2	× 94 / 464	−3.9
4	93,307	2433.1	− 2473	−39.9	× 117 / 464	−10.1
5	93,308	2482.4	− 2502	−19.6	× 123 / 464	−5.2
6	93,311	2506.3	− 2531	−24.7	× 130 / 464	−6.9
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	86,704	2408.8	− 2432	−23.2	× 99 / 429	−5.4
4	86,705	2455.4	− 2473	−17.6	× 98 / 429	−4
5	86,707	2478.8	− 2502	−23.2	× 108 / 429	−5.8
6	86,710	2516.4	− 2531	−14.6	× 124 / 429	−4.2
Sum, rounded to a whole point						−19

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	89,108	2418.0	− 2432	−14	× 92 / 410	−3.1
4	89,111	2449.1	− 2473	−23.9	× 104 / 410	−6.1
5	89,112	2494.8	− 2502	−7.2	× 99 / 410	−1.7
6	89,114	2530.0	− 2531	−1	× 115 / 410	−0.3
Sum, rounded to a whole point						−11

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	89,323	2439.9	− 2432	7.9	× 91 / 365	2
4	89,324	2461.8	− 2473	−11.2	× 87 / 365	−2.7
5	89,327	2489.7	− 2502	−12.3	× 93 / 365	−3.1
6	89,328	2546.5	− 2531	15.5	× 94 / 365	4
Sum, rounded to a whole point						0

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	89,929	2404.3	− 2432	−27.7	× 101 / 398	−7
4	89,930	2485.1	− 2473	12.1	× 95 / 398	2.9
5	89,931	2478.8	− 2502	−23.2	× 103 / 398	−6
6	89,932	2534.6	− 2531	3.6	× 99 / 398	0.9
Sum, rounded to a whole point						−9

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	90,201	2406.6	− 2432	−25.4	× 103 / 389	−6.7
4	90,202	2461.8	− 2473	−11.2	× 93 / 389	−2.7
5	90,203	2474.3	− 2502	−27.7	× 98 / 389	−7
6	90,204	2504.3	− 2531	−26.7	× 95 / 389	−6.5
Sum, rounded to a whole point						−23

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	90,091	2426.6	− 2432	−5.4	× 93 / 394	−1.3
4	90,092	2449.2	− 2473	−23.8	× 100 / 394	−6
5	90,093	2472.1	− 2502	−29.9	× 100 / 394	−7.6
6	90,094	2517.5	− 2531	−13.5	× 101 / 394	−3.5
Sum, rounded to a whole point						−18

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	90,038	2388.6	− 2432	−43.4	× 100 / 415	−10.5
4	90,039	2455.4	− 2473	−17.6	× 91 / 415	−3.9
5	90,040	2469.1	− 2502	−32.9	× 97 / 415	−7.7
6	90,041	2505.5	− 2531	−25.5	× 127 / 415	−7.8
Sum, rounded to a whole point						−30

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	89,726	2373.6	− 2432	−58.4	× 107 / 410	−15.2
4	89,727	2429.6	− 2473	−43.4	× 105 / 410	−11.1
5	89,728	2493.8	− 2502	−8.2	× 95 / 410	−1.9
6	89,729	2506.3	− 2531	−24.7	× 103 / 410	−6.2
Sum, rounded to a whole point						−34

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. −26, −19, −11, 0, −9, −23, −18, −30, −34 → −18.9
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: 8 · 2017→2018: 11 · 2018→2019: 9 · 2019→2022: 14 · 2022→2023: 5 · 2023→2024: 12 · 2024→2025: 4 → average 8.8
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 8.8 × 2.66 = 23.4. Upper limit 4.5, lower limit −42.3.

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.