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.

Answer 1

Take note of the formula for the z-score.\[z = \frac{x - \text{mean}}{\text{sd}}\]

Answer 2

You can use the command AVERAGE when you are using the Excel to find the mean.

Answer 3

You can use the STDEV for the standard deviation.