GRAPHS

Ordered pairs: find them

Sampling• Survey questioning- When finding a

sample group we want to find one that does not lean towards a certain answer.

• There are two types of groupsBias- would lean towards a certain

choice-Not a good group as it is influenced by their opinion.

Unbias- a good mixture of people who may or may not agree. A good group that samples the general public.

Analyzing scatterplots• Scatter plots are used

to find the relationships between 2 things.

• HOW DO YOU DESCRIBE IT?

You then draw a line up the middle of the direction they are going

• Using the labels on the X and Y axis describe what you see

ANS:?

Creating scatter plots

Strategy Label the X and Y

axis using the sides of the T-chart

Use T-charts and graph ordered pairs

Hoursof study

GradepercentageMr. Oliver asked

kids how long they studied for a test….

1h. 34% 44% 25% 33%2h. 25% 66% 77% 50%3h. 73% 66% 88% 68%4h. 88% 82% 93% 85%5h. 66% 90% 99% 93%

Analyzing Line plots

• Line plots allow us to find out how often a certain event number or event happens Line plots allow us to find:

Mean- Average-All scores added and divided by number of total scoresMode-Most commonMedian- Middle scoreRange- High-low scores and distance between them

Creating Line plots• Jeff polled the

class to see how many pets they owned. Below are the results. 0 1 2 3 4

3 4 0 2 3 4 2 12 0 2 3 1 3 3 2

Strategy:Just put an x above each number

Mean?Mode?Median?Ramge?

Analyzing double bar• Double bar graphs are

used to compare 2 different groups and how they respond to questions differently

• A colour key helps us to read it

•Common phrasesMore- compares one set of bars to anotherMost- means more then 50%Many - a lotLess then- lower amountMajority- over 50% of a certain colour or groupMinority- lowest set or group

Creating double bar graphs

• STRATEGY: Give it a title on

top Label bottom

with what is being compared

Create a colour key for each group

Use the Y axies to show amount

Fill in bars

Keane is comparing favourate shows for boys and girls. Here are his results. Create a double bar for him using this information.

SoapsCookingRealityNewsCartoons

GIRLS BOYSIII IIIIII III IIIIII IIII IIIII

Analyzing histograms• Histograms are like single

double bar graphs.• They measure frequency

or how often a certain occurrence happens over a particular range

They are read similar to Line plots

Creating a Histogram• Mack is recording the

size of trees outside. She needs to create a histogram to compare the frequency of tree sizes

Diameter of trees Number like that20-50 cm

51- 70 cm71- 90 cm91- 110 cm

IIII IIIIIII

IIIIIII IIII II

Strategy• List your frequencies on the

x axis1) List your amounts on the

y axis2) Top your bar up to that level

Analyzing Stem Leaf Plots• In a stem-and-leaf plot

each data value is split into a "stem" and a "leaf". The "leaf" is usually the last digit of the number and the other digits to the left of the "leaf" form the "stem". The numbers:

• 19,22,25,26,27,28,29,30,34,36,37,42,43,44,46,48,48,49,52,53,55,57,58,62

• would be split as:

We also can find :•Mean•Mode•Median•Range

Creating Stem Leaf plots

• Mean: average- add all numbers and divide by the total number of numbers added

• Mode- what number shows up the most times

• Median: the middle score

Percentage and pie graphs

• We can use ratios and equivalent ratios to solve pie graphs with totals over 100

Imagine Norman asked 800 people what their their favourate movie. How many liked each type?