ANSWER IN DETAIL

1. What information, specifically, does a z-score provide (e.g., suppose someone has a z-

score of -0.50, what does that mean)? (4 pts)

2. Use formulae and narrative descriptors to describe what is meant by the Central Limit

Theorem AND explain how the Central Limit Theorem formalizes the notion that larger

samples generally provide more accurate inferential information about a population mean

than smaller samples (8 pts).

3. In statistical hypothesis testing, why is it necessary to use a "null hypothesis"? (4 pts)

4. With regard to an experimenter's decision about the null hypothesis, DESCRIBE the two

correct decisions AND the two errors which can be made (12 pts).

5. In statistical hypothesis testing, specifically what does "p < .05" mean (4 pts)

6. Identify how each of the following affects the power of a statistical test (4 pts):

a. using 30 subjects rather than 20 subjects

b. decreasing the magnitude of a treatment effect