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Help with IA

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So this is my IA question "The relationship between countries’ GDP and the life expectancy of its population", what should I look at? My plan of investigation is: I am going to make a scatter plot and make of a line of best fit to see if there is a linear correlation between the data collected. After that, I will find the standard deviation in order to find out the dispersion of the data. With the data found, I will find the least-squares regression line to find out the equation of the line. After I will use Pearson’s Correlation Coefficient to find out the strength of the linear relationship between two variables.  To finalize my investigation I will look at the Chi-squared test to see if the data used is dependent or independent.  Should I look at anything else? Should I change anything from my plans?  



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