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?
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