You are doing a study on sleep deprivation on logical thinking. You take a sample ofn = 25individuals and deprive of them sleep so that they only get 4 hours of sleep for two nights. You then have them each solve a puzzle (this is how logical thinking is measured in this study), and find that the mean time to solve the puzzle isM = 30minutes. You know that for the population, the mean time to solve the puzzle is = 10minutes and the standard deviation is = 20. You want to answer the following research question:Does sleep deprivation have an effect on logical thinking?

You set alpha at = .05. This is a two tailed test.

What is the CRITICAL REGION or Z-SCORE value for this study? Note that this is a two-tailed test.