An introductory psychology class has 9 freshman males, 15 freshman females, 8 sophomore males, and 12 sophomore females. A random sample of n = 2 students is selected from the class. If the first student in the sample is a male, what is the probability that the second student will also be a male?

1. 17/43
2. 16/43
3. 17/44
4. 16/44

What is the probability of randomly selecting a z-score greater than z = -0.80 from a normal distribution?

1. 0.7881
2. -0.2119
3. -0.7881
4. 0.2119

What proportion of a normal distribution is located between z = +1.00 and z = -1.00?

1. 0.8413
2. 2(0.3413)=0.6826
3. 2(0.1587)=0.3174
4. 0.3413

If random samples are selected from a normal population with a s = 10 and the distribution of sample means has a standard error of 5pts, How large was the sample size?

1. n=16
2. n=25
3. n=9
4. n=4