2.1 Frequency Distributions and Their Graphs

Question 1

Frequency Distribution

Answer 1

• Table that shows intervals of data entries with a count of the number of entries in each interval.
• Usually 5-12 classes of equal width.

Question 2

Class Width (starting number)

Answer 2

• Maximum - minimum divided by number of classes (round up).

Question 3

Frequency (f)
How do you find this?

Answer 3

• Number of data entries in that class.
• Tally then count tally.

Question 4

Midpoint

Answer 4

• class # + class # divided by 2.

Question 5

Relative Frequency

Answer 5

• Frequency divided by the frequency total.

Question 6

NOT ON U2 PT1 TEST Cumulative Frequency

Answer 6

• Sum of the frequency for that class and all previous classes.

Question 7

Histogram

Answer 7

• Graphic display of data that shows bars of the same width; bars always touch; use broken axis when necessary.
• Compares data in varying intervals.
• Quantitative data.
• Vertical scale : frequency of classes
• Horizontal scale : identifies variable; uses midpoints for scale

Question 8

Stem and leaf chart was created by….

Answer 8

John Turky