Mathew is planning to run the full-scale study with 350 students. Assume that the full-scale sample also follows a normal distribution with population mean 7 and standard deviation 2.3. Mathew expects...

Mathew is planning to run the full-scale study with 350 students. Assume that the full-scale

sample also follows a normal distribution with population mean 7 and standard deviation 2.3.

Mathew expects that the mean posttest score on the full sample will be about 8.5. What is the

z-score corresponding to the full sample mean?