Question

Using the z-score of ±1.645 for the 5 percent cutoff and the z-score of ±1.96 for the 2.5 percent in the tail, identify the subject identification (ID) number for subjects who are closest to the cutoff for the upper 2.5 percent and 5 percent of the scores and the lower 2.5 percent and 5 percent of the scores.

I am working on a project with ages and heights. I have the z-scores for both. I just don't understand the above question and how I am to find the upper and lower of the scores. Thank you, Lisa

Answer 1

Z = (score-mean)/SD

Insert Z, mean and SD values to solve for scores