Exam 2-Scatterplot

Question 0

Response variable

Answer 0

Measures outcome on each individual; denoted by y

Question 1

Bivariate data

Answer 1

Data collected on two variables for each individual in the study. We study the relationship between these two variables.

Question 2

Explanatory

Answer 2

May explain or influences changes in the response variable; denoted by X

Question 3

Correlation coefficient

Answer 3

A measure of strength of the linear relationship between two quantitative variables , r

Question 4

Analyzing Quantitative Bivariate Data

Answer 4

1. Plot data with scatter plot, look for overall pattern of relationship, especially outliers
2. Compute r
3. Model linear relationship with a straight line equation called the regression equation

Question 5

Examine Scatterplot for Relationship

Answer 5

1. Direction- positively sloped as x increases y increases, negatively sloped as x increases, y decreases
2. Form - linear , shape suggests straight line ; nonlinear - shape suggest curvature (quadratic, exponential)
3. Strength - strong (hotdog) points concentrate about the form; weak - points very loosely scattered about the form hamburger.