Download presentation

Presentation is loading. Please wait.

Published byJocelyn Parker Modified over 5 years ago

1
SCATTERPLOT AND PERSONS PRODUCT- MOMENT CORRELATION COEFFICIENT. EXERCISE 2E AND 2F

2
A visual display of the relationship between two numerical variables. SCATTERPLOTS

3
ANALYSING SCATTERPLOTS

4
SCATTERPLOT GALLERY POSITIVE RELETIONSHIP

5
NEGATIVE RELATIONSHIP

6
PERFECT LINEAR RELATIONSHIP

7
NO LINEAR RELATIONSHIP

8
DESCRIBE THIS CORRELATION

9
SCATTERPLOT Decide whether or not a relationship exists between the variables and, if it does, comment on whether it is positive or negative; weak, moderate or strong: and whether or not it has a linear form

10
EXAMPLE Data showing the average weekly number of hours studied by each student in year 12 at Strathmore Secondary College and the corresponding height of each student.

11
PEARSONS PRODUCT-MOMENT CORRELATION COEFFICIENT

13
PLEASE ADD THIS TO YOUR NOTES!!! THIS IS FOUND ON PG 87 OF YOUR TEXTBOOK.

14
EXAMPLE

15
There is a formula, but r is often done using CAS calculator. There are two limitations when using r: 1. Since r measures the strength of a linear relationship, it would be inappropriate to calculate r for data which are not linear. 2. Outliers can bias the value of r. Therefore, it will make it an unreliable measure of the strength of that linear relationship. CALCULATING R AND THE COEFFICIENT OF DETERMINATION WE MUST DRAW A SCATTERPLOT FIRST IN ORDER TO CHECK FOR A LINEAR FORM BEFORE r IS CALCULATED

16
COMPLETE EXERCISE 2E PG 85 QS 1-6 COMPLETE EXERCISE 2F PG 88 QS 1-4 CLASSWORK/HOMEWORK

Similar presentations

OK

Linear regression Correlation. Suppose we found the age and weight of a sample of 10 adults. Create a scatterplot of the data below. Is there any relationship.

Linear regression Correlation. Suppose we found the age and weight of a sample of 10 adults. Create a scatterplot of the data below. Is there any relationship.

© 2018 SlidePlayer.com Inc.

All rights reserved.

To make this website work, we log user data and share it with processors. To use this website, you must agree to our Privacy Policy, including cookie policy.

Ads by Google