Answered: Predicting student proficiency test…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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Predicting student proficiency test scores accounting for poverty and income measures: Data was collected on 608 school districts in Ohio (The Cincinnati Enquirer, Nov 30, 1997) using passage rates in 1996. The variables used in this analysis include:

% passed – percent of all 4rth, 6^th, 9^th and 12^th graders who passed the state’s exam eg: 93.85 means 93.85%

% on ADC – percent of all students in the district receiving Aid for Dependent Children eg: 0.11 means 0.11%

% Free Lunch – percent of all students who qualify for reduced- priced lunches Median Income – reported in dollars

1. Report the 95% confidence interval estimate of the linear effect of %free lunches on predicting passing rates and interpret this interval in the correct units of measurement.

Lower: -0.530119553

Upper: -0.468276262

% on ADC, X by % Passed, Y
% Passed
100
70
40
20
10
10 20
50
70
% Freelunch, X by % Passed,Y
20
10
10000
200m
20000
40000
50000
20
10
20
100

Variable
Least Squares Regression Equation
slope
pvalue
R?
% on ADC
78.2580 - 0.6908x
-0.6908
0.0000
0.57
% Free Lunch
81.7279 - 0.4992x
-0.4992
0.0000
0.6239
Median Income 38.9149 + 0.0013x
0.0013
0.0000
0.4813

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