Bell RingerGet out your notebook and prepare to take notes on

Chapter 12

What do the words “frequency,” “data,” and “survey” mean in mathematics?

Chapter 12Data Analysis and

Probability

12.1 – Frequency Tables, Line Plots, and Histograms

Essential Question:

How do we display data in frequency tables, line plots, and histograms?

12.1 cont.Choose an integer from 0-9

Which number was chosen most frequently?

12.1 cont.Frequency

Number of times a data item occursFrequency Table

Lists each data item with the number of times it occurs

12.1 cont.Line Plot

Displays data with X marks above each data value on a number line

12.1 cont.Histogram

Special type of bar graph with no spaces between barsHeight of bar shows the frequencyIntervals are of equal size and do not overlap

12.1 - ClosureHow do we display data in frequency tables, line plots, and

histograms?

1. Frequency Table Draw table Tally frequency of data Add tally marks to create frequency column

2. Line Plot Draw number line Write data values on number line Draw X marks above each number to represent frequency

3. Histogram1. Decide interval size from frequency table2. Draw graph (include axes labels and title)3. Draw bars onto graph (no spaces between bars)

12.1 - Homework

P 638-639; 2-22 even

Bell RingerGet out your 12.1 homework assignment

Get out your notebook and prepare to take notes on 12.2

What is the median of the following set of data?

𝟐 ,𝟔 ,𝟏𝟏 ,𝟏𝟑 ,𝟏𝟔 ,𝟐𝟐 ,𝟐𝟔

12.2 – Box-and-Whisker PlotsEssential Question:

How do we make a box-and-whisker plot?

12.2 cont.Box-and-Whisker Plot:

Graph that summarizes a data set along a number line

Quartiles:Divide data into four equally-sized groups

1. Lower Quartile – median of the lower half of the data2. Middle Quartile – median of the entire data set3. Upper Quartile – median of the upper half of the data

12.2 cont.Example 1:

Write a statement that compares the data in the following box-and-whisker plots:

12.2 cont.Example 2:

Write a statement that compares the data in the following box-and-whisker plots:

The range for the girls’ heights is greater than the boys’.

Overall, the boys tend to be taller than the girls.

The girls’ upper quartile is equal to the boys’ lower quartile.

12.2 cont.Example 3:

Make a box-and-whisker plot for the following data:

12.2 cont.Steps:

1. Arrange the data from least to greatest

2. Find the median

3. Find the upper and lower quartile values

4. Draw a number line

5. Mark the median, least and greatest values, and the quartiles

6. Draw a box with the quartiles as ends

7. Mark the median with a vertical line

8. Draw whiskers from the box to the least and greatest values

12.2 cont.Example 3 (cont.):

12.2 - ClosureHow do we make a box-and-whisker plot?

Use the 8 steps copied into your notebook!!

12.2 - Homework

P 644-645; 1-10, 14-16