Predictions from Data

Which graph has a correlation coefficient (r) of about -.6 ?

• a

• b

• c

• d

Determine the correlation coefficient of the given data:

• .9820

• -.9643

• 1.409

• .6864

If Joe worked 30 hours, how much is he expected to earn?

• $600

• $200

• $1000

• $800

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 140 pages. 

• 12 chapters

• 19 chapters

• 14 chapters

• 21 chapters

Choose the graph with a trend line that best fits the data.

• graph 1

• graph 2

• graph 3

• graph 4

Which of the following lines represents the trend line for the scatter plot?

• A

• B

• C

• D

Find the SLOPE for the trend line using points (2,2) and (4,3)

• 2

• 1/2

• -2

• -1/2

Find the EQUATION for the trend line (in slope-intercept form) using the points (2, 2) and (4, 3).

• y = 1/2x + 3

• y = 1/2x + 1

• y = 1/2x + 2

• y = 1/2x + -1

__________ allow us to describe data to others, compare data more easily to other data, and allow us to make predictions. For example, mathematical _________ of weather patterns allow us to predict the weather.

• Solution

• Let statement

• Mathematical Sentence

• Models

A line that represents, in general, data on a scatterplot. The ________________ is used to make predictions for other data.

• Line of best fit

• Line

• Line of symmetry

• Line segment