Jefferson Middle: 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
6	76,897	2456.3	− 2552	−95.7	× 189 / 569	−31.8
7	76,899	2488.5	− 2567	−78.5	× 198 / 569	−27.3
8	76,901	2506.6	− 2586	−79.4	× 182 / 569	−25.4
Sum, rounded to a whole point						−85

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
6	71,232	2454.1	− 2552	−97.9	× 223 / 631	−34.6
7	71,235	2471.9	− 2567	−95.1	× 194 / 631	−29.2
8	71,237	2521.9	− 2586	−64.1	× 214 / 631	−21.7
Sum, rounded to a whole point						−86

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
6	73,108	2452.8	− 2552	−99.2	× 203 / 608	−33.1
7	73,109	2459.9	− 2567	−107.1	× 208 / 608	−36.6
8	73,112	2504.9	− 2586	−81.1	× 197 / 608	−26.3
Sum, rounded to a whole point						−96

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
6	73,244	2476.4	− 2552	−75.6	× 187 / 559	−25.3
7	73,246	2466.6	− 2567	−100.4	× 185 / 559	−33.2
8	73,248	2496.5	− 2586	−89.5	× 187 / 559	−29.9
Sum, rounded to a whole point						−88

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
6	73,704	2444.0	− 2552	−108	× 158 / 509	−33.5
7	73,705	2481.0	− 2567	−86	× 172 / 509	−29.1
8	73,706	2506.5	− 2586	−79.5	× 179 / 509	−28
Sum, rounded to a whole point						−91

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
6	73,862	2430.7	− 2552	−121.3	× 171 / 451	−46
7	73,863	2433.2	− 2567	−133.8	× 133 / 451	−39.5
8	73,864	2457.0	− 2586	−129	× 147 / 451	−42
Sum, rounded to a whole point						−127

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
6	73,844	2429.2	− 2552	−122.8	× 141 / 433	−40
7	73,845	2453.1	− 2567	−113.9	× 163 / 433	−42.9
8	73,846	2481.8	− 2586	−104.2	× 129 / 433	−31
Sum, rounded to a whole point						−114

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
6	73,826	2413.1	− 2552	−138.9	× 154 / 456	−46.9
7	73,827	2459.3	− 2567	−107.7	× 134 / 456	−31.6
8	73,828	2450.9	− 2586	−135.1	× 168 / 456	−49.8
Sum, rounded to a whole point						−128

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
6	73,500	2419.9	− 2552	−132.1	× 120 / 405	−39.1
7	73,501	2420.9	− 2567	−146.1	× 147 / 405	−53
8	73,502	2441.8	− 2586	−144.2	× 138 / 405	−49.1
Sum, rounded to a whole point						−141

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. −85, −86, −96, −88, −91, −127, −114, −128, −141 → −106.2
Typical year-to-year change: how far the result moved from each year to the next, ignoring up or down. 2015→2016: 1 · 2016→2017: 10 · 2017→2018: 8 · 2018→2019: 3 · 2019→2022: 36 · 2022→2023: 13 · 2023→2024: 14 · 2024→2025: 13 → average 12.3
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 12.3 × 2.66 = 32.7. Upper limit −73.5, lower limit −138.9.

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.