Chapter 3f

1Suppose that grade point averages of undergraduate students at one university have a bell-shaped distribution with a mean of 2.54 and a standard deviation of 0.44. Using the empirical rule, what percentage of the students have grade point averages that are no more than 2.1? Please do not round your answer.

.16

Suppose that grade point averages of undergraduate students at one university have a bell-shaped distribution with a mean of 2.56 and a standard deviation of 0.38. Using the empirical rule, what percentage of the students have grade point averages that are at least 1.42? Please do not round your answer.

99.85

standard deviation

a computed measure of how much scores vary around the mean score

What measure of center should be used for quantitative data sets

mean or median

variance

measure of how far the data values are spread from the mean

What measure of center should be used for qualitative data sets

mode

How to determine the mean, median, and mode on a graph

mode is the highest point on the graph, median splits the data into two, and mean is pulled towards outliers

z score

the number of standard deviations a particular score is from the mean