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Investigate if there is any correlation between the Death rate of a country (deaths/1,000 population) and the Life expectancy at birth (years).

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My aim is to investigate if there is any correlation between the Death rate of a country (deaths/1,000 population) and the Life expectancy at birth (years).

        The Death rate of a country is the amount of people dying per 1000 population in a given year.

        The life expectancy at birth shows the average number of years to be lived by a group of people born in the same year, if mortality at each age remains constant in the future. It shows the life expectancy on average for the total population for male and females. Life expectancy at birth is also a measure of overall quality of life in a country and summarizes the mortality at all ages.

        The reason for doing this investigation is that I have seen a lot of documentaries and read a lot of articles in the newspaper which have talked about how countries with higher death rates have lower life expectancies.  I will like to prove this theory and see if the data correlates.

Data collection:

The data I collected was the Death rate of a country (deaths/1,000 population)

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The histograms are roughly normally distributed so I will use the PMCC.

Now I am going to calculate

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In my data I can see on the scatter diagram that there seems to be two outliers.  I will delete these and see if the line of regression will be different.


As you can see that although the equation is different it is not enough to conclude that the outliers make a big difference.

Also the sample was only from 200 countries and there are more countries in the world so a more fair representation would be to random sample from every country in the world.  This was out of my hand because my source did not include some of these countries due to political reasons.

Overall I am very happy with the accuracy of my data because I got it from a very reliable source (www.CIA.gov website).  Having a reliable source for my data enables me to achieve my aim of negative correlation.

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