Which of the following is true about a negative slope coefficient?

Question 18 options:

a)

It is a primary indicator of heteroskedasticity.

b)

A slope coefficient should never be negative.

c)

It should be excluded from the model because it results in higher error.

d)

It indicates that, on average, as the x-variable increases, the y-variable decreases.

If the points on a scatter plot all fall on a straight line, which of the following is true about the standard error?

Question 20 options:

a)

It equals 1.

b)

It must be between 0 and 1.

c)

It equals 0.

d)

It could be either -1 or 1.

If the points on a scatter plot all fall on a straight line, which of the following is true about the coefficient of determination?

Question 19 options:

a)

It must be between 0 and 1.

b)

It equals 1.

c)

It equals 0.

d)

It could be either -1 or 1.

If the points on a scatter plot all fall on a straight line, we can conclude that

Question 21 options:

a)

100 percent of the variation in "x" is being accounted for by its relationship with "y"

b)

Zero percent of the variation in "x" is being accounted for by its relationship with "y"

c)

Zero percent of the variation in "y" is being accounted for by its relationship with "x"

d)

100 percent of the variation in "y" is being accounted for by its relationship