Exam 2-Scatterplot Flashcards Preview

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Flashcards in Exam 2-Scatterplot Deck (6)
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0
Q

Response variable

A

Measures outcome on each individual; denoted by y

1
Q

Bivariate data

A

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

2
Q

Explanatory

A

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

3
Q

Correlation coefficient

A

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

4
Q

Analyzing Quantitative Bivariate Data

A
  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
5
Q

Examine Scatterplot for Relationship

A
  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.