Bivariate Data

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

What is a line of best fit used for?

• To make predictions

• To make the graph look pretty

• To connect the points

Which scatter plot best represents the line of best fit

• A

• B

• C

Determine the predicted income if 22 hours were worked on an assembly job.

• $207.30

• $449.60

• $691.90

• $543.30

What is the equation of the line of best fit?

• y = -25x + 170

• y = -5/8x + 170

• y = 25x + 170

• y = 5/8x + 170

Based on the trend line, about how many guests should be expected if the temperature is around 80 degrees?

• 8,300

• 7,300

• 8

• 9,300

What is the average rate of change between x = -2 and x = 0

• 2

• -8

• 1/8

• 8

Estimate the correlation coefficient for this scatterplot.

• r = 1.2

• r = 0.89

• r = 0

• r = -0.89

After performing analyses on a set of data, Mrs. Schoeneck examined the scatter plot of the residual values for each analysis. Which scatter plot indicated the best linear fit for the data?

• A

• B

• C

In order to graphically represent a correlation between two variables researchers construct a ___.

• skewed distribution

• histogram

• normal curve

• scatterplot