Chapter 13

Question 1

What are scatterplots used for

Answer 1

a method to assess the relationship between 2 interval-ratio variables

Question 2

Which is the independent and dependent variable for a scatterplot

Answer 2

X-independent (horizontal)
Y-dependent (vertical)

Question 3

How is the existence and strength of the relationship shown on a scatterplot

Answer 3

the closer the dots are together and to the line, the stronger the relationship

Question 4

3 ways drawing a line helps with a scatterplot

Answer 4

1.) the closer the dots to the line the stronger the relationship
2.) the angle of the line (slope up= positive, slope down= negative)
3.) pattern of the dots, if they are close in proximity to each other

Question 5

What is the line drawn on a scatterplot called

Answer 5

regression line

Question 6

What does slope mean with the variables being time males contribute and number of kids

Answer 6

If slope is 0.5 with every kid they have the male will contribute 0.5 more hours of chores

Question 7

What is Y’ for

Answer 7

used to predict a value by putting a number in for X

Question 8

Pearson’s r

Answer 8

a measure of association for two interval-ratio variables

Question 9

little r squared

Answer 9

how much does out knowledge of X increase our ability to predict Y

Question 10

What is a dummy variable

Answer 10

a nominal or ordinal variable used in a regression analysis with 2 categories numbered as 0 and 1

Question 11

Null hypothesis for pearsons R

Answer 11

there is no linear association