13) The following mathematical function is used in a specialized statistical analysis. How many degrees of freedom are used in the formula (you will need to justify your reasoning)? I'm using the u and O symbols but this equation also applies to small sets of data. Hint: expand the O's in the formula. Data set 1, # of measurements = N, mean = up, Standard deviation = ODI Data set 2, # of measurements = M, mean =up2, Standard deviation = On2 Data set 3, # of measurements = P, mean - up3, Standard deviation = D3 Result [(3k)031 + (60)052]x / Da degrees of freedom