Correlation Practice

Rank these scatter plots according to the intensity of the correlation represented, from weakest to strongest.

• 1, 2, 3, 4

• 2, 4, 3, 1

• 4, 3, 2, 1

• 1, 3, 4, 2

Rank these scatter plots according to the intensity of the correlation represented, from weakest to strongest.

• 1, 2, 3, 4

• 2, 4, 3, 1

• 4, 3, 2, 1

• 1, 3, 4, 2

What would be the correlation be between study time and test grades?

• positive correlation

• negative correlation

• no correlation

• cannot be determined

What type of correlation describes the following sentence:
The number of people that go the pool and the temperature outside.

• positive

• negative

• none

• cannot be determined

The table below shows 6 students' overall averages and their averages in their math class. If a linear model is applied to these data, which statement best describes the correlation coefficient? Hint: Make the table in Desmos and check the correlation

• It is close to −1.

• It is close to 1.

• It is close to 0.

• It is close to 0.5.

What is the correlation coefficient of the regression line?

• 0.986

• 2527

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

• 4.1

Choose two words from those listed below to best describe the correlation between the two variables.

• strong

• weak

• positive

• negative

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))

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