Author Question: In studying the relationship between two variables x and y, a scatterplot can be used to detect ... (Read 111 times)

Pineappleeh · **on:** Jul 24, 2018

In studying the relationship between two variables x and y, a scatterplot can be used to detect which of the following?
a. A positive linear relationship.
b. A negative linear relationship.
c. A relationship that is not linear.
d. All of these.
e. None of these.

Question 2

Which of the following statements about simple correlation analysis are correct?
a. When all the points in a scatter diagram lie precisely on the estimated regression line, the sample coefficient of correlation will equal 0.
b. When all the points in a scatter diagram lie precisely on the estimated regression line, the sample coefficient of correlation will show the variables to be perfectly correlated.
c. When all the points in a scatter diagram are so widely scattered as to make x completely worthless as a predictor of y, the sample coefficient of correlation will equal 1.
d. All of these.
e. None of these.