Hello - I'm trying to understand how to calculate interaction effect. The question and answer below the dotted line below are for the following run chart:

https://www.dropbox.com/s/7pn6iz0uule6fs9/Photo Sep 07, 9 35 44 AM.png

A formula appears to be provided in the question but I seem to having problems interpreting the formula. The formula seems to read: ((sum of positive A's) * (sum of positive B's)) - ((sum of negative A's) * (sum of negative B's)). However, this interpretation yields a number that is way off from the number provided in the answer.

So, based on this information, can you help me understand how the provided interaction formula is actually applied?

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QUESTION:

Calculate the interaction effect A × B (i.e., A × B+ – A × B– ).

A. 1.5

B. 205

C. –5

D. 17

E. –17

ANSWER:

C

https://www.dropbox.com/s/7pn6iz0uule6fs9/Photo Sep 07, 9 35 44 AM.png

A formula appears to be provided in the question but I seem to having problems interpreting the formula. The formula seems to read: ((sum of positive A's) * (sum of positive B's)) - ((sum of negative A's) * (sum of negative B's)). However, this interpretation yields a number that is way off from the number provided in the answer.

So, based on this information, can you help me understand how the provided interaction formula is actually applied?

=====

QUESTION:

Calculate the interaction effect A × B (i.e., A × B+ – A × B– ).

A. 1.5

B. 205

C. –5

D. 17

E. –17

ANSWER:

C

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