Correlation Line of Best Fit

Caroline weighs her new puppy every month to see how much it has grown. If age is a and weight is W, which of these is the correct equation for the line of best fit?

• W = 3.6 + 8.9

• W = 3.6a + 8.9

• a = 8.9W + 3.6

• W = 8.9a + 3.6

A small theme park is trying to determine the number of guests they should expect on a weekend, based on the temperature outside.  Based on the trend line, about how many guests should be expected if the temperature is around 80°?

• 8,300

• 8

• 7,300

• 9,300

The scatter plot below shows the number of books read by students in Mrs. Hall’s English class and their final grades. Which statement represents the best description about the line of best fit?

• The more books students read, the lower their English grade.

• The more books students read, the higher their English grade.

• The fewer books students read, the higher their English grade. 

• No relationship exists between the number of books students read and their English grades. 

Estimate the correlation coefficient

• r=-1

• r=1

• r=-0.5

• r=0.5

Estimate the correlation coefficient.

• r=-1

• r=-0.5

• r=1

• r=0.5

If the line of best fit for this table is: y = -2.28x + 51.08,

how much money do you expect to spend if you spend 4.5 hours in the mall?

• $4.50

• $20.43

• $51.50

• $40.82

Determine and describe the Correlation Coefficient.

• -0.19

  weak negative correlation

• -0.19

  strong negative correlation

• 0.04

  little to no correlation

• 0.04

  strong positive correlation

Given the following Scatter Plot, select the option that is most likely the r value.

Given the following Scatter Plot, select the option that is most likely the r value.

Find the equation of the line of best fit for the given data

• y = 163.41x+1.49

• y =- 163.41x+ 4.19

• y =- 4.19x+163.41

• y = 4.19x -163.41