### Brewer Island Elementary (Data source)

##### Source data for Brewer Island Elementary

#### 2015

Step 1 | Step 2 | Step 3 | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|

Get Mean Scale Score from line numbers in this data file. | Subtract 'met min' Scale Score. from Mean Scale Score to get Distance From Standard | Multiply Distance From Standard by proportion of students in grade. | ||||||||||||

Grade | Line number |
Mean Scale Score |
- | Scale Score: met min |
= | Distance from standard |
* | (Students tested in grade |
/ | Students) tested in school |
= | Weighted Distance From Standard |
||

3 | 2556502 | 2506 | - | 2436 | = | 70 | * | (130 | / | 373) | = | 24.39678283 | ||

4 | 2556503 | 2544 | - | 2485 | = | 59 | * | (122 | / | 373) | = | 19.29758707 | ||

5 | 2556506 | 2581 | - | 2528 | = | 53 | * | (121 | / | 373) | = | 17.19302945 | ||

Step 4 | SUM Weighted Distance From Standard to get 2015 Difference From Standard for Brewer Island Elementary | 61 |

#### 2016

Step 1 | Step 2 | Step 3 | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|

Get Mean Scale Score from line numbers in this data file. | Subtract 'met min' Scale Score. from Mean Scale Score to get Distance From Standard | Multiply Distance From Standard by proportion of students in grade. | ||||||||||||

Grade | Line number |
Mean Scale Score |
- | Scale Score: met min |
= | Distance from standard |
* | (Students tested in grade |
/ | Students) tested in school |
= | Weighted Distance From Standard |
||

3 | 77904 | 2515 | - | 2436 | = | 79 | * | (105 | / | 345) | = | 24.04347825 | ||

4 | 77906 | 2550 | - | 2485 | = | 65 | * | (121 | / | 345) | = | 22.79710141 | ||

5 | 77908 | 2582 | - | 2528 | = | 54 | * | (119 | / | 345) | = | 18.62608694 | ||

Step 4 | SUM Weighted Distance From Standard to get 2016 Difference From Standard for Brewer Island Elementary | 65 |

#### 2017

Step 1 | Step 2 | Step 3 | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|

Get Mean Scale Score from line numbers in this data file. | Subtract 'met min' Scale Score. from Mean Scale Score to get Distance From Standard | Multiply Distance From Standard by proportion of students in grade. | ||||||||||||

Grade | Line number |
Mean Scale Score |
- | Scale Score: met min |
= | Distance from standard |
* | (Students tested in grade |
/ | Students) tested in school |
= | Weighted Distance From Standard |
||

3 | 80059 | 2509 | - | 2436 | = | 73 | * | (97 | / | 312) | = | 22.69551276 | ||

4 | 80060 | 2547 | - | 2485 | = | 62 | * | (93 | / | 312) | = | 18.48076923 | ||

5 | 80062 | 2571 | - | 2528 | = | 43 | * | (122 | / | 312) | = | 16.81410256 | ||

Step 4 | SUM Weighted Distance From Standard to get 2017 Difference From Standard for Brewer Island Elementary | 58 |

#### 2018

Step 1 | Step 2 | Step 3 | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|

Get Mean Scale Score from line numbers in this data file. | Subtract 'met min' Scale Score. from Mean Scale Score to get Distance From Standard | Multiply Distance From Standard by proportion of students in grade. | ||||||||||||

Grade | Line number |
Mean Scale Score |
- | Scale Score: met min |
= | Distance from standard |
* | (Students tested in grade |
/ | Students) tested in school |
= | Weighted Distance From Standard |
||

3 | 80206 | 2488 | - | 2436 | = | 52 | * | (98 | / | 284) | = | 17.94366194 | ||

4 | 80208 | 2553 | - | 2485 | = | 68 | * | (91 | / | 284) | = | 21.78873238 | ||

5 | 80210 | 2572 | - | 2528 | = | 44 | * | (95 | / | 284) | = | 14.71830985 | ||

Step 4 | SUM Weighted Distance From Standard to get 2018 Difference From Standard for Brewer Island Elementary | 54 |

#### 2019

Step 1 | Step 2 | Step 3 | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|

Get Mean Scale Score from line numbers in this data file. | Subtract 'met min' Scale Score. from Mean Scale Score to get Distance From Standard | Multiply Distance From Standard by proportion of students in grade. | ||||||||||||

Grade | Line number |
Mean Scale Score |
- | Scale Score: met min |
= | Distance from standard |
* | (Students tested in grade |
/ | Students) tested in school |
= | Weighted Distance From Standard |
||

3 | 80699 | 2504 | - | 2436 | = | 68 | * | (118 | / | 297) | = | 27.016835 | ||

4 | 80700 | 2551 | - | 2485 | = | 66 | * | (86 | / | 297) | = | 19.11111107 | ||

5 | 80701 | 2575 | - | 2528 | = | 47 | * | (93 | / | 297) | = | 14.71717171 | ||

Step 4 | SUM Weighted Distance From Standard to get 2019 Difference From Standard for Brewer Island Elementary | 61 |

#### Last steps

##### Compute the average

2015 | 2016 | 2017 | 2018 | 2019 | Sum | Average |
---|---|---|---|---|---|---|

61 | 65 | 58 | 54 | 61 | 299.0 | 59.8 |

##### Compute the Upper Control Limit

Simply compute the standard deviation and multiply by 3 and add to the average: **71.8**

##### Compute the Lower Control Limit

Simply compute the standard deviation and multiply by 3 and subtract from the average: **47.8**

##### For the lines, you have the data necessary to plot the chart.

#### Very last step

##### The percent of students getting a Free or Reduced Price Meal comes from the following sources:

2015 | 2016 | 2017 | 2018 | 2019 | |
---|---|---|---|---|---|

Percent | 4% | 4% | 6% | 7% | 8% |

Data source | 2015 data file | 2016 data file | 2017 data file | 2018 data file | 2019 data file |

#### San Mateo-Foster City school district County of San Mateo

### THIS chart shows what the school system "wants"

### PLUS a "special" or "outside" cause of variation, parent education.

NOT what teachers want.

NOT what principals want.

NOT what parents want.

Brewer Island Elementary

*math*proficiency
Zero+ meets standard.

**4% less $meal**

**4% less $meal**

**6% less $meal**

**6% less $meal**

**6% less $meal**

• Any result above zero is proficient; below is not proficient. • There is a 99% chance that results will remain the same in coming years, which is to say, between the Upper and Lower Control Limits (the gray lines). • The houses with the % of students receiving a Free or Reduced Price Meal is a measure of wealth/poverty.