The Statistics Calculator provides college level statistics functionality. Frequency DistributionThis includes observation stats (min, max, mean, median, population and sample variance and standard deviation), sort, random sample, t-test, linear regression and more. See the following:
The formulas for the statistics are as follows:
`S = sum_1^n(x)`
(Σx)² = S²
Σx² = `sum_1^n(x^2)`
The formula for the z SCORE is as follows:
`z_y = (y - μ_X)/s` where:
- y is the single observation
- μ is the mean
- s is the sample or population standard deviation.
The formula for the least-squared regression line is in the following form: y = a + bx
where: `b = ( (sum(XY) - (sumX * sumY)"/n")) / (sum(X^2) - (sumX)^2"/n") `
and: ` a = MY - b*MX` MY is mean of Y. MX is mean of X.
Thanks to, Associate Professor of Psychology at St Mary's College of Maryland, for his advice and testing. Special thanks to Ms. Caroline Robertson for getting this library of equations off the ground.