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09 Jul 2025, 03:31
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"Just because last year it showed a relationship, regardless of what kind, does not mean it would be the same this year.", I thought because I have been doing a lot of CRs lately and therefore, I chose E. Tell me why do I believe that the second data prompt was not a trap but additional information given to solve and tell me why do I believe the last year's pattern to be true this year for this question and not other CR questions.
Am I thinking wrong or too much or am I missing nuance?
Thanks in advance for your kindness.
19 Jul 2025, 22:50
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Hi MartyMurray chetan2u Bismuth83
I am not clear how the answer to this question is (B), I think it should be (E) only as we are not given anything on correlation whether it's positive or negative. Could you please help me if I am missing anything critical in the language?
I am not clear how the answer to this question is (B), I think it should be (E) only as we are not given anything on correlation whether it's positive or negative. Could you please help me if I am missing anything critical in the language?
21 Jul 2025, 11:02
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agrasan
As many have said before, the answer as it is currently written would be E if a real GMAT test writer had written it. If the GMAT wants you to know the direction of the relationship, they WILL tell you explicitly (directly proportional, positively correlated, etc). Absent that language, a "linear relationship" can have a positive, negative OR 0 slope.
A linear relationship is defined as the following: A = mF + b (where F=forecasted units, A = actual units, m=slope of the line, and b a constant for the y-intercept).
So let's imagine a few scenarios, like a slope of 1, 0, and -1 (for ease). You can choose whatever constant you want, but I let the constant in the positive slope case just be 0, while setting it to anything for the 0-slope case just so that the entries don't disappear to 0. For the negative slope, we just need to set B to something large enough to keep units sold positive, but we just need to pick something big, so maybe 40?
The table below shows the Forecasted and then actuals under each case:
In the case of a positive slope, YES, April Actual is greater than March actual. However, in the case of a 0 slope or a negative slope, they are either equal or reversed. Therefore, it cannot be known whether actual April was greater than Actual March.
Whit
