Stats L - Linear Regression

What graph is used to represent an association between two quantitative variables?

• boxplot

• histogram

• normal curve

• scatterplot

Tags

TEKS.MATH.A.3C

What letter do we use to represent correlation coefficient?

• c
• r
• p
• h

Tags

CCSS.8.SP.A.1

CCSS.8.SP.A.2

The correlation coefficient "r" is a value between

• 0 and 1
• 0 and 100
• -1 and 1
• -2 and 2

Tags

TEKS.MATH.A.3B

What does the correlation coefficient (r) tell us?

• Style and Type

• Percentage and Direction

• Strength and Direction

• Strength and Style

A scientific study was done to research the correlation between the number of hours people spent on social media and feelings of depression. The study found a correlation coefficient of r = 1.3. Which statement is true? 

• The study shows that spending more time on social media causes higher feelings of depression. 
• The study shows that an increase in time  spent on social media tends to show an increase in feelings of depression. 
• The study shows that no relationship exists between time spent on social media and depression. 
• The study has a mistake because r should be between -1 and 1. 

If there is NO correlation, the correlation coefficient is ____.

• 1

• -1

• 0

• 100

Tags

TEKS.MATH.A.3B

r = 0.3

• Strong positive 
• Weak positive
• Strong negative
• Weak negative 

Tags

TEKS.MATH.A.3B

Attendance & grades have a correlation coefficient (r) of

- 0.89. This indicates a ______ correlation.

• Strong positive

• Weak positive

• Strong negative

• Weak negative

What would the association between elevation and temperature?

• none

• cannot be determined

• positive association

• negative association

Tags

TEKS.MATH.A.3B

What would be the association between study time and test grades?

• positive association

• negative association

• none

• cannot be determined

Tags

TEKS.MATH.A.3B