The following sample of n = 5 scores was obtained from a population with unknown parameters.

Scores: 20, 25, 30, 20, 30

Compute the sample mean and variance. (Note: These are descriptive values that summarize the sample data.) (Round your answers to two decimal places.)

M =

s =

Compute the estimated standard error for M. (Note: This is an inferential value that describes how accurately the sample mean represents the unknown population mean.)

sM

=