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Identify and fix errors in data collection

BC Grade 9 Math: Master Essential Skills & Concepts

Rational Numbers

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Comparing and ordering rational numbers

Comparing decimal numbers

Comparing fractions

Solving problems with rational numbers in decimal form

Mixed Operations with Decimals

Mixed Operations

Mixed Operations with Decimals Bracket

Mixed Operations with Bracket Square

Solving problems with rational numbers in fraction form

Operations with fractions

Determine square roots of rational numbers

Square roots of rational numbers

Power and Exponents

Using exponents to describe numbers

Expanded powers

Exponent rules

Single Power Expressions

Dividing powers

Multiplying powers

Order of operations with exponents

Using exponents to solve problems

Scale Factors and Similarity

Enlargements and reductions with scale factors

Scale diagrams

Similar triangles

Similar polygons

Polynomials

Characteristics of polynomials

What are polynomials

Equivalent expressions of polynomials

Adding and subtracting polynomials

Multiplication and Division of Polynomials

Multiplying and dividing polynomials

Divide a monomial by a monomial

Multiply a monomial by a monomial

Multiplying polynomials by monomials

Multiply a polynomial by a monomial

Dividing polynomials by monomials

Linear Relations

Representing patterns in linear relations

Represent Patterns in Linear Relations Equation Decimal

Represent Patterns in Linear Relations Equation Integer Start From 0

Represent Patterns in Linear Relations Equation Integer Start From 1

Represent Patterns in Linear Relations Equation Negative Decimal

Identify the Linear Equation

Reading linear relation graphs

Solving linear equations by graphing

Solving Linear Equations

Solving linear equations using multiplicattion and division

Solving linear equations using multiplication and division

Two-step Linear Equations LHS

Two-step Linear Equations RHS

Solving two-step Linear equations: ax+b = c, x/a +b = c

Solving two-step linear equations: ax + b = c, x/a + b = c

Solving linear equations using distributive property a(x+b)=c

Solving linear equations using distributive property: a(x + b) = c

Solving linear equations with variables on both sides

Solving literal equations

Data Collection

Influencing factors in Data Collection

Influencing factors in data collection

Probability

BC Grade 9 Math

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https://dmn92m25mtw4z.cloudfront.net/img_set/textbook-ca-bc-math9/v1/textbook-ca-bc-math9-168w.png

- Hi, welcome to this question right here. So we're trying to rewrite this question so that they don't have a bias. Okay? So that means there's a problem with the question itself already. We just have to figure it out. So the question here says, 
"What is your most favorite dessert?" We&apos;ve got A chocolate cake, B strawberry cake and C vanilla cake. Okay? 
Any problem with this question? The thing here is this, it's only asking you the most favorite dessert, okay? Now we don't see the following selections right here. When I ask you this question, "What's your most favorite dessert?" You're probably maybe thinking like, "Okay, I like jellos. I may like the chocolate cookies. I may like the yogurt." Then you see all the selections here, you'll be like, "Oh, what's going on?" I only have the chocolate cake, strawberry cake and vanilla cake to choose from. So that's kind of bias. You are leaded to just the cake. You're assuming that everybody likes the dessert cake. Okay? 
So that's not really fair. Okay? So what happen is, we want to eliminate that-- 
this part right here. The most favorite dessert, and then they're thinking-- the survey is thinking that or trying to lead you that it's the cake that you like the best. Okay? Because you maybe like something else but they're trying to lead you to the cake. Okay, so this is probably done by the cake company and turned it into a survey. So what happened is, what we can do is this. We're going to change the question to something like, "Which of the following cake you like the most?" This is more reasonable. It kind of puts your own preference away and actually puts yourself in another perspective that okay, we&apos;ve got a list of cakes here for you. Okay? You don't have your own preference. These are the cakes for you and you're just going to pick something you like the most. Okay? 
So what happened here is, that if you read it again it says, "Which of the following cake you'll like the most?" We&apos;ve got a chocolate cake, strawberry cake and vanilla cake. So right now you just-- 
When you jump into this part here, you'll know that you're picking the cakes. Just the cakes, and you're picking the one that you'd like the most. Whereas the first one, it kind of leads you to the problem where you're actually-- They're trying to lead you that, assuming that everybody likes the cake. Okay? So that's not a good part right here. So the most favorite dessert right here, this dessert part should change to, give you a list of cakes right here. Okay? This is a much better question comparing to the first one. Pretty tricky, but if you read it a couple of times you will see the difference. Okay? Thanks for watching.

The results of researches are heavily affected by the process of data collection. However, the process is prone to errors. For example, biased and misleading survey questions, and leading survey questions can all affect the results greatly. In this lesson, we will learn how to identify and fix these errors.

Influencing factors on data collection

Application of averages