Question

a. If r is a negative number, then b (in the line of regression ) is negative.

true or false

b.The line of regression is use to predict the theoric average value of y that we expect to occur when we know the value of x.

true or false

c. We can predict no matter the strength of the correlation coefficient.

true or false

d. The set of all possible values of r is, {r: -1< r < 1

treu or false

e. The graph of the line of regression is always satisfied by the point (0,1).

true or false

f. There are different values for the correlation coefficient for a same sample.

true or false

g. The lineal correlation coefficient is a method to determine the equation that represents the relationship between two variables.

true or false

h. All points (x, ?̂ ) are over the graph of the line of regression.

true or false

I. All points in an scatter diagram lie over the line of regression.

true or false

J. In a multiple lineal regression, there are two or more independent variables and only one dependent variable.

true or false

K. The relationship between variables x & y may be due to a third variable (stange variable)

true or false

L. a correlation of 0.03 is considered to be a null one

       true or false

M.an strong correlation between two variables establishes a cause and effect relationship between them

      true or false

N. a positive correlation is also known as direct

       true or false

O. if r=1 then all points in the scatter diagram are over the line of regression

   true or false

Answer 1