The following sample of n = 7 scores was obtained from a population with unknown parameters. Please compute the sample mean, variance, and estimated standard error for M. Scores are 2, 18, 15, 5, 15, 8, & 7. Since you can’t compute the variance until you have computed the sum of squares (SS), and degrees of freedom (df), I am also including the SS formula, and degrees of freedom (df) formula below.
n = 7
∑X = 70
∑X^2 = 916
Step 1: Compute the Sample Mean.
Step 2: Sum of Squares (SS)
Step 3: Compute the Variance
Step 4: Compute the estimated standard error for M.