Chapter 2 - Summarizing and Graphing Data

Question 1

Frequency Distribution

Answer 1

Shows how data are partitioned among several categories (or classes) by listing the categories along with the number (frequency) of data values in each of them.

Question 2

Lower Class Limits

Answer 2

The smallest numbers that can belong to the different classes.

Question 3

Upper Class Limits

Answer 3

The largest numbers that can belong to the different classes.

Question 4

Class Boundaries

Answer 4

Numbers used to separate the classes, but without the gaps created by class limits.

Question 5

Class Midpoints

Answer 5

The values in the middle of the classes.

Question 6

Class Width

Answer 6

The difference between two consecutive lower class limits (or two consecutive lower class boundaries).

Question 7

Class Width Formula

Answer 7

Max Data Value - Min Data Value/# of Classes

Question 8

Relative Frequency Formula

Answer 8

Frequency for a Class/Sum of All Frequencies

Question 9

Percentage for a Class

Answer 9

Frequency for a Class/Sum of all Frequencies X 100%

Question 10

Cumulative Frequency Distribution

Answer 10

The frequency for each class is the sum of the frequencies for that class and all previous classes.

Question 11

Histogram

Answer 11

A graph consisting of bars of equal width drawn adjacent to each other (unless there are gaps in the data).