Finally, calculate the standard deviation by finding the square root of the variance, which is 5.6 or 6. How Is This Useful? Knowing the standard deviation can help you determine which option is ...

Variance = Sum of the Squares of the Difference Between Each Return and Mean Average Return / Number of Returns Standard Deviation = Square Root of Variance Canva ...

The common assumptions made when doing a t-test include those regarding the scale of measurement, random sampling, normality of data distribution, adequacy of sample size, and equality of variance ...