Correlation Practice

Which of these would be a strong positive relationship?

• r=0.9

• r=0.4

• r=-0.9

• r=-0.4

Which of these would be a weak negative correlation?

• r=0.1

• r=-0.1

• r=-0.7

• r=0.7

Which of these would be a weak positive correlation?

• r=-0.3

• r=0.8

• r=-0.8

• r=0.3

Which of these would be a strong negative correlation?

• r=0.85

• r=0.6

• r=-0.85

• r=-0.6

Analysis of data from a statistical study shows a linear relationship in the data with a correlation coefficient of -0.93. Which statement best summarizes this result?

So, r = -0.93

• There is a strong positive correlation between the variables.

• There is a strong negative correlation between the variables.

• There is a weak positive correlation between the variables.

• There is a weak negative correlation between the variables.

The results of a linear regression are shown below.

y=ax+b

a = −1.15785

b = 139.3171772

r = −0.896557832

Which phrase best describes the relationship between x and y?

• strong negative correlation

• strong positive correlation

• weak negative correlation

• weak positive correlation

What does the correlation coefficient for the data indicate about the strength of the linear association between the x and y variables

Hint: what is the correlation based on the scatter plot

• strong negative

• weak negative

• strong positive

• weak positive

What does the correlation coefficient for the data indicate about the strength of the linear association between the time spent practicing and number of incorrect notes played?

Hint: What does the scatter plot imply about the data?

• weak negative

• strong negative

• strong positive

• weak positive

What would the correlation coefficient say about this linear association?

• strong negative

• weak negative

• strong positive

• weak positive

What would the correlation coefficient say about this linear association?

• strong negative

• weak negative

• strong positive

• strong negative