literacy and thinking bivariate data investigations
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Literacy and thinking bivariate data investigations. Anna Martin Avondale College. Literacy and thinking. Thinking about data Thinking about relationships Thinkin g about sources of variation Communicating understanding Improving literacy. Thinking behind unit. - PowerPoint PPT PresentationTRANSCRIPT
Anna MartinAvondale College
LITERACY AND THINKING
BIVARIATE DATA INVESTIGATIONS
LITERACY AND THINKING
• Thinking about data• Thinking about relationships• Thinking about sources of variation
• Communicating understanding • Improving literacy
THINKING BEHIND UNIT
• Who were we doing the unit with?• What was there prior knowledge?• What were their identified needs?• What strategies could we use?• What else did we know had worked previously?
LITERACY AND THINKING STRATEGIES
SOLO for levels of thinking – identify features, use features to explain relationships• Structuring paragraphs using TEXT
• T (topic sentence)• E (evidence)• X (explanation)• T (tie up)
SETTING THE CONTEXT
What are people worried about?
What areas might be affected?
How could you get data?
Is this for real?
UNPACKING LEARNING OUTCOMES
• LO: Use the statistical enquiry cycle to investigate multivariate data
• Get students to try to explain what the words enquiry, cycle and multivariate mean
• Share understandings and acknowledge contributions
• Model more than one way to explain something
FROM ONE VARIABLE TO TWO
• Focus on rental prices (one variable)
• Explore what might be affecting/linked/related to rental prices e.g. rugby world cup, suburb, number of bedrooms
• Lots of structure early on to help with writing
FROM ONE VARIABLE TO TWO
• “How much is the typical weekly rent for a house in Kingsland?”
Analysis: Mark on your dot plot the lowest rental price and the highest rental priceConclusion: Complete the sentence “In Kingsland, the rents range from $____ to $_____”Analysis: Mark on your dot plot the middle 50% of house prices (remind them that half of 20 is 10, so where do the middle 10 house sit between).Conclusion: Complete the sentence “The rents are typically between $____ and $____”Analysis: Mark on your dot plot any common rent prices (modes)Conclusion: Complete the sentence “Common rent prices in Kingsland are $___ and $____”
WHY BIVARIATE?
Get the students into the habit of reflecting on their investigation, in particular the dataWhy do the rental prices in Kingsland vary so much? (answers could be: because the condition of houses are different, where they are located is different, how many bedrooms they have etc.)Why are there two common rental prices? (one would be the typical price for 1-bedroom houses, and one would be the typical price for 2-bedroom houses)
COMPLETE ANOTHER CYCLE…..
What happens when you compare the rent by number of bedrooms?Greater shift in rent prices (but still variation)What appears makes more difference to rent – where the house is, or how many bedrooms it has?
King
slan
dSa
ndrin
gham
200 300 400 500 600 700 800 900 1000Rent_per_week
Rental data Dot Plot
Area "Kingsland"= Area "Sandringham"= or
THE PAINT BRUSH
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Number_of_bedrooms1 2 3 4 5 6
Rental data Scatter Plot
Area "Mt Eden"=
Houses with fewer bedrooms tend to rent for less than houses with many bedroomsStill variation in rental prices for houses with the same number of bedrooms
THE PAINT BRUSH
THINKING ABOUT RELATIONSHIPS
Get the students to paint pictures e.g. use a paint brush to show the relationship between your age and your heightVery scaffolded at first – put age along the bottom (in years) and put height along the side (in units of 10 cm)Students verbally describe what would happen as you get olderThen try to paint the relationship (direction, type and strength by width of paint brush)Build up ideas of suitable units, scales, ranges for variables, explanatory/response, no relationships
THE ELLIPSE
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Number_of_bedrooms1 2 3 4 5 6
Rental data Scatter Plot
Area "Mt Eden"=
Using for relationships we think are linearNot easy at first but students get thereHelps position line of best fitCan use for informal predictions
LINKING FEATURES AND STATEMENTS
Describe the relationship:• in context• positive/negative• strength/type• does it make
sense?
Use the names of the variablesIt’s a positive relationship because….It’s a strong linear relationship because….
Points are close to the lineOverall the points look like they make a lineThe line slopes upAs one gets bigger the other gets biggerLow goes with low, high goes with high
FORMATIVE ASSESSMENT
Is there a relationship between the size of a family and the number of bedrooms for their house?
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Size_of_family1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
Collection 1 Scatter Plot
Bi-variate investigationLO: Use the relationship between two variables to make a prediction
Relate features of a relationship
Describe the relationshipUse the relationship to make a prediction
LO: Use the relationship between two variables to make a prediction
LO: Use the relationship between two variables to make a prediction
Problem
LO: Use the relationship between two variables to make a prediction
You want to manufacture a 10G memory stick.How much do you charge for it?
Plan
LO: Use the relationship between two variables to make a prediction
Collect data about what other USB sticks cost.On the next few pages are USB sticks being sold by Dick Smith Electronics. For each one, record in a table how many GB they are, and their selling price.
Data (example of table)
LO: Use the relationship between two variables to make a prediction
Memory (GB) Price ($)
DataLO: Use the relationship between two variables to make a prediction
Data
LO: Use the relationship between two variables to make a prediction
Analysis
LO: Use the relationship between two variables to make a prediction
There are no USB drives that are 10GB currently advertised.How do we work out how much we should charge?
Problem: Is there a relationship between the GB of a memory stick, and how much is costs?
Analysis
LO: Use the relationship between two variables to make a prediction
Draw a scatter plot of the data.
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GB2 4 6 8 10 12 14 16 18
DSE USB stick data Scatter Plot
Conclusion (relationship)
LO: Use the relationship between two variables to make a prediction
Describe the relationship between GB and price for the USB sticks.
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GB2 4 6 8 10 12 14 16 18
DSE USB stick data Scatter Plot Is it a linear relationship?Positive/negative?
Strength?
Amount?
Unusual?
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GB2 4 6 8 10 12 14 16 18
DSE USB stick data Scatter Plot
Conclusion (prediction)
LO: Use the relationship between two variables to make a prediction
Use the relationship to make a prediction for 10GB.
Try to imagine painting across the values, draw the ellipse, add the line
Use the line to see how much a 10GB memory stick might cost
Answer the problem!!
Reflection
LO: Use the relationship between two variables to make a prediction
Think about where the data came from, what else might effect the price of a USB memory stick, what you could do to extend the investigation.
Write two “I wonder….” statements for this investigation.
Bivariate investigationLO: Write a plan for a bivariate investigation
List the steps for a method
Identify variables for the investigationDescribe how the variables will be measuredExplain how the data will be collectedDecide how much data to collect
LO: Write a plan for a bivariate investigation
LO: Write a plan for a bivariate investigation
Problem
LO: Write a plan for a bivariate investigation
What is the relationship between the size of the hard-drive memory and the selling price for laptops?
What variables will you investigate?
LO: Write a plan for a bivariate investigation
What is the relationship between the size of the hard-drive memory and the selling price for laptops?
WRITE: The variables I will investigate are……
WRITE: The explanatory variable will be ……
WRITE: The response variable will be ……
The size of the hard-drive memory and the selling price for different laptops
Hard-drive memory (because I think this will explain the selling price of the laptop)
Selling price (because I think this will change/respond to different sizes of hard-drives)
How will you collect data for the investigation?
LO: Write a plan for a bivariate investigation
What is the relationship between the size of the hard-drive memory and the selling price for laptops?
THINK: Are the variables things I can measure myself or can I find measures for the variables from somewhere?
WRITE: I can collect data for this investigation by ……
These variables have already been measured by stores or people selling laptops
Getting ads for laptops being sold that say how big the hard-drive memory is and what price the laptop is being sold for from advertising pamphlets.
How will you measure these variables?
LO: Write a plan for a bivariate investigation
What is the relationship between the size of the hard-drive memory and the selling price for laptops?
THINK: What units should I use? How accurate do I need to be? What equipment do I need?
WRITE: I will measure the variables by using…..
GB for the hard-drive memory and rounding the selling price to the nearest $100.
What things might affect the measures you take?
LO: Write a plan for a bivariate investigation
What is the relationship between the size of the hard-drive memory and the selling price for laptops?
THINK: Does it matter where I get my data from? Do I need to be careful about getting a range of data? Should I focus my investigation more?
WRITE: I wonder if things like…………. might also affect the selling price for laptops
the screen size, the processing speed, how the laptop looks
How many measures will you collect?
LO: Write a plan for a bivariate investigation
What is the relationship between the size of the hard-drive memory and the selling price for laptops?
THINK: How much data do I need? If I am working in a group, how much should each of us collect?
WRITE: I will collect data about ______ different laptops. We will make sure __________________
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we each collect around 10 values each
How will you record your results?
LO: Write a plan for a bivariate investigation
What is the relationship between the size of the hard-drive memory and the selling price for laptops?
THINK: What things should I write down for each laptop? How will I organise this data?
WRITE: I will use a ________ to record my results. I will use ______ columns for each of the two variables.
table
2
Group work!
LO: Write a plan for a bivariate investigation
What is the relationship between the size of the hard-drive memory and the selling price for laptops?
In your group, discuss how you will each contribute to the development of a plan for the assessment. Make a commitment to each person that you will attend each day of the assessment and that you will not let them down. Write down how you will demonstrate to your teacher that each person has contributed to the writing of the plan.