Statistics Coursework - Bivariate Data.

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Bivariate Data                Shahida Jaffer

Statistics Coursework

Bivariate Data

INTRODUCTION

Moving to a new area with so much choice, my parents are skeptical about which middle school my brother should go to.  They want to find a school that doesn’t just do well in one subject at Key Stage 2, but at least two out of the three subjects.  I am going to investigate this by looking at maths and science results for children at Key stage 2 achieving level 5 to see if I can find a school with a positive correlation between them.  This will be shown if a school dos well in maths, and does just as well in science, and if it does badly in maths, does it do equally as badly in science.  

DATA COLLECTION

The data I have used was collected from the ‘Department for Education and Skills’ Website, under the section of performance tables for primary schools at Key Stage 2.  I chose to get the data for schools within 15 miles around my postcode (MK5 8BS), the nearest being printed first.  This population included data about special schools, which I removed.  I also removed those schools who had no figures in the table, and concentrated only on the data for maths and science results at Level 5.  Because there were too many pieces of information, I sampled by picking every third school, which reduced my sample under investigation to 55 schools.

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QUALITY OF DATA

This data was found on an official government Website and thus must be accepted as accurate, although it could be subject to human error.  This error could have occurred by either the ‘Department for Education and Skills’ when publishing and calculating the information or by myself, in the transference of results.  To improve the quality of the data I am using, I removed those schools that had no data and those which were from special needs schools, so they would not effect the results.  From the scatter diagram, you can see that there are no ...

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