Introduction

Scattergraphs like the one below are used to help determine whether there is a relationship between two factors. In this case, is there a relationship between Life Expectancy and the number of Doctors per 10,000 population ?

Look at the scattergraph for the following data and answer the following(not to be submitted for marks):

1) What pattern do the dots create ? (are they randomly scattered, clustered, or located along a general direction?)

2) What relationship between the two factors (Life Expectancy and Doctors) does this graph appear to show ?

3) Egypt and Japan have close to the same number of doctors per 10,000 population, yet life expectancy for the Japanese is significantly longer. What factors might explain this ?