Algebra Correlation

the graphs below represents what type of correlation?

a

positive correlation

negative correlation

No correlation

Estimate the correlation coefficient for this scatterplot.

(a)  

• r = -0.9

• r = 1

• r = 0.9

• r = -1

Which statement identifies the correlation coefficient between the two variables and the correct interpretation of the correlation coefficient as a measure of the strength of the linear association?

• r = 0.9591; The correlation coefficient indicates a weak, positive, linear correlation.

• r = 0.9199; The correlation coefficient indicates a strong, negative, linear correlation.

• r = 0.9591; The correlation coefficient indicates a strong, positive, linear correlation.

• r = 0.9199; The correlation coefficient indicates a weak, negative, linear correlation.

What type of correlation the scatter plot shows?

• Positive correlation

• Negative correlation

• No correlation

• Non-linear correlation

Is this line an accurate line estimate of best fit for the data?

• Yes

• No

What is the equation of the line of best fit

• y = -2x + 10

• y = 10x + 2

• y = 2x + 10

• y = 10

Use your graphing calculator to enter this data, then calculate the equation for the line of best fit. (Round each decimal to the nearest tenth)

• y = -25.1x + 5.6

• y = 25.1x + 5.6

• y = -5.6x + 25.1

• y = 5.6x + 25.1

The table gives the number of hours spent studying for an algebra exam (x) and the final exam (y). Determine the correlation of the data.

• Weak positive

• Weak Negative

• Strong Positive

• Strong Negative

Determine the correlation of the points on the scatterplot.

• Positive Correlation

• Negative Correlation

• No Correlation

• Zero Correlation

Determine the correlation of the points on the scatterplot.

• Positive Correlation

• Negative Correlation

• No Correlation

• Zero Correlation