if you had to order t-shirts for your entire school, what sample would you choose to help you...
TRANSCRIPT
If you had to order t-shirts for your entire school, what sample would you choose to
help you predict how manyt-shirts of each size to order?
In this lesson you will learn how to identify representative
samples by differentiating between biased and unbiased
methods of sampling.
Let’s Review
The population is the entire groupbeing studied.
A sample is part of the population being surveyed.
A Common MistakeHow tall
are 7th graders?Not all samples will lead to good predictions about an entire population.
Core Lesson
Representative sample
Valid inference
?accurate
prediction based on
data
Core Lesson
Sampling method
Unbiased Biased
Core Lesson
This sample comes from a biased sampling method. It is not representative of the
population.
Core Lesson
This sample comes from an unbiased sampling method.
It is representative of the population.
Core Lesson
Another example: Color of leaves in September
a) 100 fallen leaves collected from the groundb) 100 leaves on tree branchesc) 50 fallen leaves and 50 leaves on branchesd) 50 fallen oak leaves and 50 oak leaves on branches
Core Lesson
Representative sample
Valid inference
Unbiased sampling method
In this lesson you have learned how to identify
representative samples by differentiating between
biased and unbiased methods of sampling.
Guided Practice
A market researcher wants to know how 18-25 year old women spend their money. Which group would be a representative sample?a) 18-25 year old women at the mallb) 18-25 men and women commuting to workc) Women of all ages commuting to workd) 18-25 year old women commuting to work
Extension Activities
In a complete paragraph, describe why the following sampling method is biased, and suggest an unbiased method.
You want to know your town’s favorite fast-food restaurant. You randomly ask 30 people their preference as they leave one of the fast-food restaurants in town.
Extension Activities
Choose a population and something you would like to learn about it. Identify examples of biased sampling methods and unbiased sampling methods.
1. Population: 2. Desired information:3. Examples of biased sampling methods:4. Examples of unbiased sampling methods:
Quick Quiz
1. An ice-cream company wants to find out if its ice cream is the favorite in the state. Which group would be a representative sample?a) Customers who visit their storeb) Employees of ice cream stores in the statec) People at the state faird) Adults entering a gym in the capital city
Quick Quiz
2. Which is an unbiased sampling method for predicting the type of payment most frequently used at a grocery store?Record the type of payment used by…a) Students at the local high schoolb) Every 10th customer entering the storec) Every 10th customer in the cash-only lined) Visa card holders
Lesson Slides Rubric
Use this rubric to ensure your lesson plan is great!
Math Rubric Criteria for Success Things to avoid
Storyline or Arc of the Lesson
There is a clear arc to the lesson. One slide leads naturally to the next so that there is a flow and a building of meaning
All the components of the lesson are there but they seem disconnected, as if the author wrote each without thinking about how they fit into the whole.
Hook Slide
The teacher poses a simple question that illicits the response, “yeah, I do wonder how that works…”
The question is short A relevant example is included when it is short and
further pulls the learner in The question mirrors what the student will learn, then
need to do later in the guided practice
The question seems formulaic, inauthentic, or overly “school-ish” (message: you have to learn this because you’re in school rather than, this is genuinely interesting)
The hook is overly-complicated and potentially confusing The question does not parallel the guided practice questions
Objective Slide
The objective follows the form (you will learn X by doing Y)
Is concise and follows the form provided in the examples
Does not follow the form Is overly vague in describing either the X or the Y Is too long Is written for teachers but not students
Let’s Review
Reminds the student of how this lesson fits with other lessons (the lesson, however, should still be able to stand on its own)
Reminds the student of important vocabulary Is as concise as possible Uses visuals whenever possible
Is either too detailed or not detailed enough in connecting the lesson to other lessons
Leaves out important touch points Makes the lesson overly dependent on the other lessons
(student will be confused or feel like they’ve made a mistake, if they watch this lesson alone)
Common Mistake Points out a common mistake that students make Concisely explains the thought process that leads to that
mistake
Isn’t actually a mistake students make (too simple) Is confusing or vague
Modeling a Way of Looking at It
Clearly models a way to look at the standard Uses visuals as often as possible to show how the way of
looking works Is in “think aloud” format. The teacher is opening up
his/her thought process to the student Takes advantage of every opportunity to explain why the
math works the way it works Engages the learner by asking questions along the way to
build suspense Uses an an example to show the way in action Explains how this way of looking at it shows why the
common mistake (see above) is a mistake
Focuses on the algorhythm (or trick) instead of on showing a way of looking at the math
Fails to use visuals to show a way Fails to explain his/her thinking along the way. The teacher
effortlessly runs through the steps as if it’s all obvious and easy Does not ask any questions along the way to pull the learner in Misses opportunities to explain the why behind the math Fails to explain why this way of looking at the math addresses
the common mistake
Objective Review
Reviews the objective in a way which conveys, “we’ve come full cicle and now you see this objective with new eyes.”
Serves as a “let’s pull this all together” moment that helps organize the lesson in the learner’s mind
Creates abrupt feeling between the lesson and the reviewing (subtext: “we’re done with this lesson, let’s quickly bring it to a close.”)
Guided Practice Is at the same difficulty level modeled in the lesson Is connected to the initial hook question
Seem unrelated to the hook question Is at a different difficulty level than that modeled in the lesson
Extension Activity Suggestions
Includes a suggestion for a struggling student who needs more opportunities for practice
Includes a suggestion for students who seem to get it but need more practice
Includes a suggestion for students who get it and are ready to be challenged further
Suggestions should clearly build from the approach in the core lesson
Does not include differentiation Does not thoughtfully connect or flow from the lesson Does not clearly build from the approach in the core lesson Does not give a range of activities
Aesthetics
The slides use the correct colors (blue, green, red) in the correct sequence.
The slides use the correct fonts The slides use handwriting and the handwriting appears
as written in the right places The slides only use the headers/titles provided The slides use the provided visuals or include visuals
created by the author or LearnZillion The slides use animation, highlighting, and circling to
scaffold the learning, keeping the eye focused on what the teacher is introducing/explaining
The slides clean and uncluttered. The visuals and text do not exceed the maximum amount (see tutorial for example of maximum)
The slides use other colors or vary the order of the colors The slides add new headers/titles that aren’t part of the
template The slides use clip art The slides are cluttered Animation is distracting and feels more like sizzle than part of
the steak
Graphic and Image Templates
Copy and Paste items from these slides to make your presentation look great!
You can copy and paste these items into any slide
Green text box that appears letter by letter
Green text box that fades in
Blue text box that appears letter by letter
Blue text box that fades in
Red text box that appears letter by letter
Red text box that fades in
You can copy and paste these items into any slide—make sure you copy both the bubble and
the text!Do I feel strongly about it?
Do I have a lot to say?
Do I feel strongly about
it?
Do I have a lot to say? Do I have a lot to
say?
You can copy and paste these items into any slide. You can resize them as
needed! Use black text when you write in me please! Also, keep my text left-justified rather than centered!
Use black text when you write in me please! Also, keep the text left-justified rather than centered!
All arrows can be recolored by changing the “shape fill.” You can also resize them or rotate
them!
[Write first step here…]1
2 [Write second step here…]
3 [Write third step here…]
You can use these when discussing main ideas or steps in a process…
You can resize any of these boxes and use them to highlight text or ideas.
Let’s Review
A Common Mistake
Guided Practice
Quick Quiz
Extension Activities
Core Lesson