Formula for standard error = Pop SD / SQRT (n) Sample 1: Sample Mean, SE & Z score |Sample 2: Sample Mean, SE & Z score for a sample of n = 160 for a sample of n = 160 Sample S.E. Sample Z score S.E. Z score Mean Mean 16.13 17.03 Sample 3: Sample Mean, SE & Z score Sample 4: Sample Mean, SE & Z for a sample of n = 160 score for a sample of n = 160 Sample S. E. Sample Z score S.E. Z score Mean Mean 16.53 16.35 Record (mark) the Z values for the sample means on the graphic below. You can pl "x" either on or under the graphic to mark the location of each sample mean. -3 -2 2 3