Statistical analysis
Our variables are:
1) Length of left forearm-independent variable (scale data)
2) Length of left foot-dependent variable (scale data)
We will be using Pearson's R to compute the correlation coefficient, with the following assumption net.
Assumption 1: All observations must be independent of each other.
Assumption 2: The dependent variable should be normally distributed at each value of the indepedent variable.
Assumption 3: The dependent variable should have the same variability at each value of the independent variable.
Assumption 4: The relationship between the dependent and independent variables should be linear.
The diagram below is a scatter plot to check for linearity and homogenous variance in assumption 3 and 4.
The table below shows Pearson's correlation coefficient of 0.877 which indicates a very strong relationship between the length of arm and foot.
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