Which of the following is NOT a guideline for establishing causalitiy?a. checkif the efffect is present or absent when the response variable is present or absent. b. Check if the effect is present or absent when the explanatory variable is present or absent. c. look for cases where correlation

solution:

→c= a b , that is product of a and b is possible only when when a is m × n matrix and b is n × p matrix.

that is, number of columns of a= number of rows of b.

so, size of matrix , c= a b is , if a = (m × n)matrix

b= (n × p)matrix

then a b = [ (m × n)matrix] ×[   (n × p)matrix ]

→→c= a b= [m × p ] matrix

→→size of product a b will be equal to = number of rows of a × number of columns of b

the height of the surface increases from the center out to the sides of the road

it is c!

its kinda hard to answer this when we dont have all the information that we need.