Andre is completing a questionnaire containing over 400 items covering five major categories: tools and equipment, perceptual and physical requirements, mathematical requirements, communication requirements, and decision making and responsibility. Andre is using the:

A key advantage of the microdialysis technique is that

A) it can easily be used in humans. B) it offers the ability to sample transmitter substances in a living, conscious organism. C) it uses radioactive molecules that break down quickly. D) it can assess brain function on a moment-by-moment basis. E) the technique requires the use of powerful computers to monitor human brain function.

Which of the following is a fundamental difference between the t statistic and a z-score?

a. The t statistic uses the sample mean in place of the population mean. b. The t statistic uses the sample variance in place of the population variance. c. The t statistic computes the standard error by dividing the standard deviation by n - 1 instead of dividing by n. d. All of these are differences between t and z.