Chapter 11 Recap

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Lythia Amoakon

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Chapter 11 Recap and Practice

This will have a quick recap of chapter 11.
It will also go over the types of questions you may be asked and how to solve them.
Please let me know at the end if it helped improve your understanding of Chapter 11.
There are 2 points EC on Exam 1 for completing the lesson before Wednesday, September 20th.

1. The Scatterplot

Multiple Choice

What is a scatterplot?

A type of pie chart

A type of bar graph

A graphical representation of ordered pairs (X,Y)

A type of line graph

Explanatory vs Response

On the Y-axis of the scatterplot
Is explained
The variable that we are studying, predicting

Response

On the X-axis of the scatterplot
Explains
The variable that we can control or manipulate

Explanatory

Dropdown

Number of hours studying for a test

Problems missed on the test

Dropdown

For each of the following pair of variables, determine which one is the explanatory and which is the response variable.

The Outdoor temperature is

and Consumption of heating oil is

The age of a car is

and its resale value is

Direction, Shape and strength

Scatterplot gives the direction and shape

We are looking for a linear relationship in this class.
If the relationship is not linear, we just mention non-linear.

Categorize

Options (4)

The age of a car and the number of miles on its odometer

The number of times a pencil is sharpened and its length

The age of a car and its resale value

The diameter of an apple and its weight

For each of the following pair of variables, determine if the relationship is positive or negative.

Positive

Negative

Direction, Shape and strength

The correlation coefficient

Gives the direction and strength of a LINEAR relationship.
Correlation DOES NOT imply Causation.
Correlation IS sensitive to outliers

Match

Match the following

Is r appropriate?

Why?

Yes,

Weak Linear Relationship

No,

We have Outliers

No,

Non-linear Relationship

Yes,

Linear Relationship

Reorder

Reorder the STEPS to find the correlation coefficient using the TI-84

(Some a broken down in 2)

2^nd --> 0 --> X^-1--> DiagnosticsOn --> Enter

(Diagnostics Turned On)

STAT --> 1:Edit -->

L1: X, L2:Y

(Adding the lists)

STAT --> CALC --> 8 -->

Xlist:L1, Ylist:L2 -->Calculate

The Regression Line Equation

a + bx

b is the slope and can be interpreted as follow :
- If b is positive :
  For every increase in the explanatory (x) variable, the response variable increases by b.
- If b is negative :
  For every increase in the explanatory (x) variable, the response variable decreases by b.

About Residuals

I know we talked about residuals today in class; after looking at the book for more examples, It seems like this is not something that we cover in this class anymore.
We only cover Sections 1 and 2 now.
I apologize for the mix-up. I will make sure to fix it for the next class :)

Multiple Choice

Here are the advertised horsepower ratings (hp) and expected gas mileage (mpg) for several 2001 vehicles.

Describe the scatterplot.

Negative Linear

Positive Linear

Negative Non-Linear

Positive Non-Linear

The relationship is negative linear

Negative: Our plot goes from the upper left to the lower right.

Linear: We can draw a line where most of the points will be packed around.

Fill in the Blanks

Here are the advertised horsepower ratings (hp) and expected gas mileage (mpg) for several 2001 vehicles.

Give the regression equation

Finding the regression equation with TI-84

Turn your diagnostics on
Add your lists : L1 : Horsepower and L2: Gas Mileage
STAT --> CALC --> 8 --> Xlist : L1, Ylist: L2
Substitute a and b with the values from the calculator
Remember the general for the equation is a+bx

Fill in the Blanks

Here are the advertised horsepower ratings (hp) and expected gas mileage (mpg) for several 2001 vehicles.

Give the correlation coefficient

Finding the correlation coefficient with TI-84

The Correlation coefficient, r, is the last result on your calculator using the same steps as before.
Turning the diagnostic on enables you to see r
and here, r= -0.88

Fill in the Blanks

Here are the advertised horsepower ratings (hp) and expected gas mileage (mpg) for several 2001 vehicles.

Give the slope

Dropdown

Here are the advertised horsepower ratings (hp) and expected gas mileage (mpg) for several 2001 vehicles.

Interpret the slope

For every 1

, the

by 0.092

Finding the slope with TI-84

The slope is b on your calculator and in your equation.
b = -0.092
For every 1 hp , the gas mileage decreases by 0.092 mpg .

More questions

Multiple Choice

What is not true about the correlation coefficient?

It measures the strength and direction of the linear relationship between two variables

It ranges from -1 to 1

It is not affected by changes in the scale of measurement

It can be used to infer causality

It is not resistant

Multiple Choice

The correlation coefficient between the price of eggs and the price of milk is 0.845.

In a month where the price of eggs is above average, would you expect the price of milk to be above average or below average? Explain.

Above average, because the positive correlation indicates that as one variable increases, the other also increases.

Below average, because the positive correlation indicates that as one variable increases, the other decreases.

Above average, because the negative correlation indicates that as one variable decreases, the other also decreases.

Below average, because the negative correlation indicates that as one variable decreases, the other increases.

Multiple Choice

The correlation coefficient between the price of eggs and the price of milk is 0.845.

Which of the following is the best interpretation of the correlation coefficient?

When the price of eggs rises, it causes the price of milk to rise.

When the price of milk rises, it causes the price of eggs to rise.

When the price of milk rises, it causes the price of eggs to drops.

Changes in the price of eggs or milk do not cause changes in the price of the other; the correlation indicates that the prices of milk and eggs tend to go up and down together.

Multiple Choice

The correlation coefficient between the height and weight of the quarterbacks is 0.674.

Which of the following is the best interpretation of the correlation coefficient?

If a quarterback gains weight, he will grow taller.

Given two quarterbacks, the taller one is likely to be heavier than the shorter one.

Given two quarterbacks, the heavier one is likely to be shorter than the lighter one.

Dropdown

When we are given the value of the

variable, we can use the least-squares regression line to predict the value of the

variable.

Multiple Choice

To the left is the least-squares regression line for predicting the price of milk from the price of eggs.

If the price of eggs differs by $0.25 from one month to the next, how much would you expect the price of milk to differ?

0.10

0.25

-0.25

-0.10

Finding the predicted difference

Δ means difference.
Let's answer the question we got and do more practice.
Our regression equation is : 2.7592 + 0.3991x
We are looking for the predicted difference in price of milk given the difference in price of eggs from one month to another.
Δx = $0.25
b = 0.3991
Hence, Δy = 0.3991 * $0.25 = $0.10

Δy= bΔx

The math behind this equation
y₁=a+bx₁
y₂= a+bx₂
Δy=y₂-y₁=a+bx₂- (a+bx₁)
Δy=a-a+bx₂-bx₁
Δy = b(x₂-x₁)
Δy= bΔx

Multiple Choice

To the left is the least-squares regression line for predicting the price of milk from the price of eggs.

If the price of eggs differs by $0.5 from one month to the next, how much would you expect the price of milk to differ?

0.20

0.5

-0.25

-0.12

Multiple Choice

To the left is the least-squares regression line for predicting weight from height.

If two quarterbacks differ in height by 2 inches, how much would you predict their weights to differ?

9.2

4.6

-2

Open Ended

Would you prefer the recap for chapters to be like this?

Did this help you with Chapter 11?

Type response here

Chapter 11 Recap and Practice

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