AA Section 3-6

SECTION 3-6Fitting a Line to Data

Warm-up

Complete the In-class Activity on page 168

Scatterplot:

Scatterplot: A collection of discrete points that describe a situation (data)


Line of Best Fit/Regression Line:


Line of Best Fit/Regression Line: A line that comes close to most of the points in a scatterplot



***Does not need to touch any points!!!***



Coefficient of Correlation:






Determines the strength of the relationship between the variables






***Will be on -1 ≤ r ≤ 1***






***Will be on -1 ≤ r ≤ 1***

***When r < 0, the slope is negative. When r > 0, the slope is positive.***






***Will be on -1 ≤ r ≤ 1***

***When r < 0, the slope is negative. When r > 0, the slope is positive.***

***The closer that |r| = 1, the stronger the correlation.***

Example 1

We’re comparing time spent exercising with resting heart rates. The info is in your notes. And we’re going to go through the graphing process.

Example 2a. What correlation exists?


Positive


Positive

b. What is the correlation value (r)?


Positive


r = .7260615475


Positive


r = .7260615475

c. If you spent 5 hours a week studying, what grade would you expect?


Positive


r = .7260615475

c. If you spent 5 hours a week studying, what grade would you expect?

About a 77

Homework

Homework

p. 172 #1, 3-7, 14, 15, 20 (a, b, d, g, h, i), 21-27

“Your true value depends entirely on what you are compared with.”

- Bob Wells

AA Section 3-6

Education

Transcript of AA Section 3-6