Descriptive Statistics

Which BEST describes a data set?

All raw scores make up a data set.

A data set with two modes is called a

bimodal distribution

The _____ is the difference between the highest and lowest scores in a distribution

range

In the following data set, what is the mode? 3, 7, 8, 4, 4, 5, 9, 10, 6, 2

4

In the following data set, what is the median? 3, 7, 8, 4, 4, 5, 9, 10, 6, 2

5.5

In the following data set, what is the range? 3, 7, 8, 4, 4, 5, 9, 10, 6, 2

8

Measures of _____ describe the scores in the middle of a distribution

central tendency

What is the singular word for data

datum

Measures of _____ describe whether the values in a data set are spread out or clumped together.

variability

The mean, median, and mode are all measures of:

central tendency

. What are two types of measures numbers can be grouped into?

central tendency and variability

A _____ allows researchers to display how many times each score occurs.

frequency histogram

A graph that contains single points that are connected with a line is called a

frequency polygon

The average score is also called the

mean

In a skewed distribution, which is the BEST measure of central tendency to use

median

The _____ is the score that is located in the middle of all scores

median

The _____ is the score that occurs most often in a data set.

mode

A _____ distribution is symmetrical and has a bell shaped curve

normal

In a _____ distribution, the mean, median, and mode are all the same number.

normal

What are two common measures of variability?

range and standard deviation