Scatter Plots and Correlation

The correlation coefficient is a number "r" such that: 

• -1<r<1

• -1>r>1

• -1≤r≤1

• -1≥r≤1

If the correlation coefficient of a table of data is 0.85, what is true about the line of best fit?

• There is a weak, positive relationship

• There is a strong, positive relationship

• There is a weak, negative relationship

• There is a strong, negative relationship

You are analyzing a scatter plot that has a negative correlation. What is true of the of the x and y values?

• As x increases, y decreases

• As x increases, y increases

• As x decreases, y decreases

In a scatterplot of the average grade point of a high school student and the average hours that he/she spend on his/her homework, you expect to see:

• very little association

• a strong association

• a weak positive association

• a strong positive association

What would the correlation be between math grades and the time it takes to run a mile ?

• Postive Correlation

• Negative Correlation

• No Correlation

• Cannot Be Determined

When looking at a scatter plot, there are three types of association:

• linear, nonlinear, no

• positive, negative, no

• linear, circular, no

• up, down, no

When points in the scatter plot appear to form two or more distinct clouds of points, it's called...

• clusters

• bunches

• groups

• cliques

As the independent variable increases, the dependent variable decreases

• positive correlation

• negative correlation

• no correlation

When the scatter plot shows an increase in the outputs as the inputs are increasing

• positive correlation

• negative correlation

• no correlation

What type of association or correlation does the scatter plot represent?

• positive

• negative

• no