1) Asample is obtained from a population with = 25 and = 12.Which of the following samples would produce the most extreme z score (farthest from zero)?

a. a sample of n = 36 scores withX-bar = 20

b. a sample of n = 36 scores with X-bar = 22

c. a sample of n = 9 scores with X-bar = 22

d. a sample of n = 9 scores with X-bar = 20

2) You have found a nonsignificant effect of Thought Field Therapy on anxiety in the study you conducted, but in the real world (if applied to the whole population), this treatment DOES work. You have

a. too much power to detect an effect of the IV on the DV

b. rejected the null hypothesis

c. made a type II error

d. made a type I error

3) which of the following accurately defines a type II error

a. Retaining H₀ when it is true

b. Rejecting H₀ when it is true

c. Rejecting H₀ when it is false

d. Retaining H₀ when it is false

4) Decreasing the alpha level (e.g., from = .05 to = .01)___________.

a. decreases the size of the critical region

b. increases the probability that the sample will fall into the critical region

c. deceases the probability of a type I error

d. a, b, and c occur when alpha is decreased

e. both a and b

f. both a and c

g. both b and c

5) When experimental results are NOT significant (i.e., they are nonsignificant), this means that the ____ hypothesis has been ___.

a. alternative; rejected

b. null; retained

c. alternative; retained

d. null; rejected

6) Over the past 20 years, the average person who ran the fun run in Anywhere, Alaska has finished in 30 minutes. Dr. Smith wants to know whether drunk runners run in more time or less (a different amount of time) when they run the same course.

If H_A is that _runners 30, then H₀ must be

a. _runners = 30

b)_runners > 30

c)_runners < 30

d)_runners 30