Select accurate statements (no partial credit will be given).

a. an observed relationship between two variables might be the results of a third variable.

b. factor analysis is a bivariate analysis

c. correlation alone prove causality.

d. the ranges of variability on each of the two variables under study are restricted, significant correlations between the two variables are difficult to find.

e. multiple regression analysis is a multivariate analysis

b

step-by-step explanation:

the word superfluous means unnecessary

a_n = a_1 + (n - 1)d

the first term is 6.

the common difference d = ?

when you find d, replace n with 7 and d with the common difference to find your answer.

step-by-step explanation:

for exempl this   system of equations   y = x - 3

                                                                y = 2x - 5

look   the line : y = x -3     ( red)

                            the line : y = 2x -5 ( bleus)

6 equilateral triangles