4-5 Displaying Data

4-5 Displaying Data By: yup me again!!!

Displaying data • Bar Graph: good for displaying data that can be grouped into categories. • Frequency table: if data is given to you as a list, it helps to organize it in a frequency table

Example • The following is a report of a randomly chosen group of 20 KMS boys of how often they picked boogies a day. • 18, 17, 16, 16, 17, 16, 16, 16, 19, 16, 16, 17, 16, 17, 18, 16, 18, 16, 19, 16 • First organize into a frequency table

# of times 16 boogies were picked a day Frequency

17

11

4

18

19

3

2

Make a bar graph

Displaying data • Histogram: a type of bar graph where the bars represent intervals in which the data are grouped • George surveyed 15 people to find out how many pages were in the last book they read. • 368, 157, 27, 187, 240, 636, 98, 114, 64, 212, 302, 144, 76, 195, 200

Histogram Pages 0-99 100-199 200-299 300-399 400-499 500-599

Frequency 4 5 3 2 0 0 1

600-699 With a histogram, the bars are touching

Line graph • A line graph is used to show trends or to make estimates for values between data points. • Make a line graph of the given data to estimate the number of polio cases in 1993. Year

# of Polio cases worldwide

1975

49,293

1980

52,552

1985

38,637

1990

23,484

1995

7,035

Practice

Amount of allowance $1-$5

Frequency

$6-$10

7 8

$11-$15

4

$16-$20

1