Jacoby Creek Elementary: math

The shaded band is this district'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	13,761	2510.5	− 2436	74.5	× 50 / 285	13.1
4	13,762	2477.2	− 2485	−7.8	× 44 / 285	−1.2
5	13,765	2537.1	− 2528	9.1	× 50 / 285	1.6
6	13,766	2549.4	− 2552	−2.6	× 53 / 285	−0.5
7	13,769	2603.3	− 2567	36.3	× 45 / 285	5.7
8	13,770	2657.4	− 2586	71.4	× 43 / 285	10.8
Sum, rounded to a whole point						29

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	12,790	2483.5	− 2436	47.5	× 56 / 296	9
4	12,792	2535.8	− 2485	50.8	× 50 / 296	8.6
5	12,794	2538.4	− 2528	10.4	× 48 / 296	1.7
6	12,797	2539.4	− 2552	−12.6	× 49 / 296	−2.1
7	12,799	2620.6	− 2567	53.6	× 51 / 296	9.2
8	12,800	2655.8	− 2586	69.8	× 42 / 296	9.9
Sum, rounded to a whole point						36

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	13,125	2491.5	− 2436	55.5	× 47 / 301	8.7
4	13,128	2503.2	− 2485	18.2	× 53 / 301	3.2
5	13,130	2553.3	− 2528	25.3	× 54 / 301	4.5
6	13,132	2555.7	− 2552	3.7	× 48 / 301	0.6
7	13,134	2594.1	− 2567	27.1	× 50 / 301	4.5
8	13,136	2658.7	− 2586	72.7	× 49 / 301	11.8
Sum, rounded to a whole point						33

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	13,139	2504.6	− 2436	68.6	× 44 / 300	10.1
4	13,142	2515.9	− 2485	30.9	× 51 / 300	5.3
5	13,143	2550.0	− 2528	22	× 54 / 300	4
6	13,146	2600.7	− 2552	48.7	× 53 / 300	8.6
7	13,147	2582.3	− 2567	15.3	× 51 / 300	2.6
8	13,150	2615.6	− 2586	29.6	× 47 / 300	4.6
Sum, rounded to a whole point						35

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	13,269	2480.4	− 2436	44.4	× 46 / 303	6.7
4	13,270	2511.3	− 2485	26.3	× 48 / 303	4.2
5	13,271	2543.0	− 2528	15	× 54 / 303	2.7
6	13,272	2567.4	− 2552	15.4	× 53 / 303	2.7
7	13,273	2641.1	− 2567	74.1	× 55 / 303	13.5
8	13,274	2638.3	− 2586	52.3	× 47 / 303	8.1
Sum, rounded to a whole point						38

2021 from sb_ca2021_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	13,105	2459.9	− 2436	23.9	× 43 / 283	3.6
4	13,106	2515.3	− 2485	30.3	× 51 / 283	5.5
5	13,107	2509.2	− 2528	−18.8	× 47 / 283	−3.1
6	13,108	2524.4	− 2552	−27.6	× 44 / 283	−4.3
7	13,109	2601.2	− 2567	34.2	× 45 / 283	5.4
8	13,110	2576.5	− 2586	−9.5	× 53 / 283	−1.8
Sum, rounded to a whole point						5

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	13,294	2458.5	− 2436	22.5	× 48 / 289	3.7
4	13,295	2515.8	− 2485	30.8	× 43 / 289	4.6
5	13,296	2546.3	− 2528	18.3	× 56 / 289	3.5
6	13,297	2557.4	− 2552	5.4	× 51 / 289	1
7	13,298	2575.2	− 2567	8.2	× 48 / 289	1.4
8	13,299	2650.5	− 2586	64.5	× 43 / 289	9.6
Sum, rounded to a whole point						24

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	13,271	2463.2	− 2436	27.2	× 50 / 291	4.7
4	13,272	2501.3	− 2485	16.3	× 52 / 291	2.9
5	13,273	2547.2	− 2528	19.2	× 45 / 291	3
6	13,274	2576.2	− 2552	24.2	× 52 / 291	4.3
7	13,275	2601.5	− 2567	34.5	× 46 / 291	5.5
8	13,276	2615.5	− 2586	29.5	× 46 / 291	4.7
Sum, rounded to a whole point						25

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	13,232	2453.0	− 2436	17	× 47 / 297	2.7
4	13,233	2513.8	− 2485	28.8	× 49 / 297	4.8
5	13,234	2548.3	− 2528	20.3	× 55 / 297	3.8
6	13,235	2578.3	− 2552	26.3	× 45 / 297	4
7	13,236	2614.6	− 2567	47.6	× 52 / 297	8.3
8	13,237	2624.6	− 2586	38.6	× 49 / 297	6.4
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	13,198	2460.0	− 2436	24	× 49 / 292	4
4	13,199	2521.9	− 2485	36.9	× 43 / 292	5.4
5	13,200	2525.6	− 2528	−2.4	× 50 / 292	−0.4
6	13,201	2589.2	− 2552	37.2	× 51 / 292	6.5
7	13,202	2608.4	− 2567	41.4	× 47 / 292	6.7
8	13,203	2647.0	− 2586	61	× 52 / 292	10.9
Sum, rounded to a whole point						33

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. 29, 36, 33, 35, 38, 5, 24, 25, 30, 33 → 28.8
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: 3 · 2017→2018: 2 · 2018→2019: 3 · 2019→2021: 33 · 2021→2022: 19 · 2022→2023: 1 · 2023→2024: 5 · 2024→2025: 3 → average 8.4
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 8.4 × 2.66 = 22.3. Upper limit 51.1, lower limit 6.5.

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 — for a district, the total across its schools. From 2014–15, 2015–16, 2016–17, 2017–18, 2018–19, 2020–21, 2021–22, 2022–23, 2023–24, 2024–25, 2025–26.

Schools in Jacoby Creek Elementary

Jacoby Creek