PSY340: Statistics for the Social Sciences

Part I:

1) Suppose that the people living in a particular city have a mean score of 40 and a standard deviation of 5 on a measure of concern about the environment. Assume that these concern scores are Normally distributed. Approximately what percentage of people have a score
a) above 40?
b) above 45?
c) above 30?
d) above 35?
e) below 40?
f) below 35?
g) below 30?

For this same situation, what is the minimum score a person must get to be in the top
h) 2%
i) 16%
j) 50%

2) Consider a test of coordination that has a normal distribution, a mean of 50, and a standard deviation of 10.
a) How high a score would a person need to be in the top 5%
b) Explain your answer (to somebody who has never had a statistics course).