5-7 Scatter Plots and Lines of Fit A

Determine whether each graph shows a positive correlation, a negative correlation, or no correlation.

• positive correlation

• negative correlation

• no correlation

Determine whether each graph shows a positive correlation, a negative correlation, or no correlation.

• positive correlation

• no correlation.

• negative correlation

If there is a correlation, describe it.

• as time

  increases, the number of funds decreases

• the number of years increases, the number of funds increases

• as time

  decreases, the number of funds increase

Write the slope-intercept form of an equation for the line of fit.

The line of fit shown passes through

(1993, 16) and (1999, 5.7).

• y = -1.7x + 3404

• y = -1.55x - 3093.5
• y = 1.55x + 3093.5
• y = -1.55x + 3093.5

Use (1997, 13) and (2005, 22) to find the slope.

• 8/9

• 9/8

• 9

• 8

The scatter plot shows the relationship between the number of chapters and the total number of pages for several books.  Use the trend line to predict how many chapters would be in a book with 180 pages. 

• 12 chapters
• 15 chapters
• 18 chapters
• 21 chapters

Graph has a slope of 1/2 and a y- intercept of 1.  Write the equation in slope - intercept form

• y = 1x+1/2
• y = 1/2x + 1

In the scatter plot, does the image shows a "Line of Best Fit"?

• Yes
• No

Which graph shows a line of best fit for the scatter plot?

• Graph A
• Graph B
• Graph C
• Graph D

Match the following vocabulary words with their definitions.

• Positive Correlation

• When x increases, y increases

• Scatter Plot

• a cluster of data that shows a relationship between two numerical variables

• Negative Correlation

• No trend.

  Scattered data does not show a relationship.

• No Correlation

• When x increases, y decreases.

• Line of Best Fit

• The line that best represents data on a scatter plot.