Displaying and Analyzing Data

Chapter 11-1 Notes: Reporting Frequency

Who Remembers Mean, Median, Mode? The MEAN of a set of data is the sum of the data

divided by the number of items (the average) Example: 79 + 42 + 62 + 18 + 54 = 255 = 51

5 5

The MEDIAN of a data set is the middle value when the data are arranged in numerical order.

Example: 1 2 2 4 6 6 6 7 8

The MODE of a data set is the item that occurs most frequently.

Example: 17 16 18 17 16 17 = 17

How Can We Report Frequency?

A Frequency Table is a table that lists each item in a data set with the number of times the item occurs.

Let’s look at this example:

Ice Creams sold each day at lunch:

45 48 53 50 46 46 50 51 48 46 45 50 49 46, 51

Ice Cream Sold

Tally Frequency

45

46

47

48

49

50

51

52

53

Try this on your own!

The Numbers below represent the ages of the students in a gymnastics class.

Make a Frequency Table of the data.

11 5 9 13 8 9 9 11 10 8 6 7 12 11 13 12 7 6 11 12 10 8

Let’s fill it in! Check Your Answers.

Age Tally Frequency

Here’s Another way to Display Data: A LINE PLOT is a graph that shows the

shape of a data set by stacking X’s above each data value on a number line.

X X

X X X X

X X X X X X __________________________________________________

1 2 3 4 5 6 7 8

Let’s Try This One:

For Example: Ty is planning a school garden. He asked his teachers how many rose bushes they would like in the garden. He recorded the data in a frequency table.

Use the Frequency Table to make a Line Plot.

# Rose Bushes

Tally Frequency

1 I 1

2 IIII 4

3 III 3

4 IIIIII 6

5 I 1

6 I 1

“Rose Bushes Wanted”

_____________________________________________________________________

1 2 3 4 5 6

Investigation!!

Collecting Data: Let’s take a Poll! AOL’s Top 7 Songs are: 1. “No One” by Alicia Keys 2. “Low” feat. T-Pain by Flo Rida 3. “With You” by Chris Brown 4. “Yahhh/ Report Card” feat ARAB: Soulja Boy Tell’em 5. “Our Song” by Taylor Swift 6. “Crank That (Soulja Boy): Soulja Boy Tell’em 7. “Crank Dat Batman” by Pop It Off Boyz

Choose A Method to Display the Results!

Our Favorite Song Is…..

Favorite Song Tally Frequency

#1

#2

#3

#4

#5

#6

#7

Does Our Line Plot Agree?

________________________________________

1 2 3 4 5 6 7

The End

Write your Homework down! Begin HW if there is time!