Question: Write a function PearsonCor, which input is a data frame with two numerical columns. It calculates the Pearson correlation coefficient inside and returns a

Write a function PearsonCor, which input is a data frame with two numerical columns. It calculates the

Write a function PearsonCor, which input is a data frame with two numerical columns. It calculates the Pearson correlation coefficient inside and returns a single value (don't use built in cor function). Round your answer to 3 digits. Sample input mtcars $mpg, mtcars $hp Sample output -0.776

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