Standard Deviation and Correlation Coefficient

Estimate the correlation coefficient.

• r = -0.8

• r = -0.5

• r = 0.5

• r = 0.8

Estimate the correlation coefficient for this scatterplot.

• r = 1.2

• r = 0.89

• r = 0

• r = -0.89

In a scatterplot r is called

• Coefficient of Determination

• Correlation coefficient

• Regression Line

• Slope

Use Desmos to generate the linear regression model for this data set. What is the correlation coefficient, r?

• 0.9499

• 11.7313

• 193.852

• 0.9746

What is the correlation coefficient of the regression line?

• 0.986

• 2527

• total length (cm) = 1.1forklength (cm) + 4.1

• 4.1

Tags

CCSS.8.EE.C.8C

As shown in the table, a person's target heart rate during exercise changes as the person gets older. Find the correlation coefficient (r).

• -0.999

• -0.664

• 0.998

• 1.503

Determine the correlation coefficient of the given data.

• - .5477

• .1770

• .8956

• - .9463

What is the formula for calculating correlation coefficient?

• (nΣxy + ΣxΣy) / √((nΣx^2 + (Σx)^2)(nΣy^2 + (Σy)^2))

• (nΣxy - ΣxΣy) / ((nΣx^2 - (Σx)^2)(nΣy^2 - (Σy)^2))

• (nΣxy - ΣxΣy) / √((nΣx^2 - (Σx)^2)(nΣy^2 - (Σy)^2))

• (nΣxy - ΣxΣy) / ((nΣx^2 - (Σx)^2) + (nΣy^2 - (Σy)^2))

What does a correlation coefficient of -0.8 indicate about two variables?

• Very weak negative linear relationship

• Strong negative linear relationship

• Very weak positive linear relationship

• Strong positive linear relationship

Use Desmos to generate a linear regression model. What is the value of the correlation coefficient, r?

• 0.8458

• 0.6918

• 3.19403

• 75.9403