GATE AG 2018 • Q10 MCQ • 2 Marks

Section 8: General Aptitude

Analytical & Spatial Aptitude

Subtopic: Logic Deduction & Pattern Recognition

Question Statement:

In a detailed study of annual crow births in India, it was found that there was relatively no growth during the period 2002 to 2004 and a sudden spike from 2004 to 2005. In another unrelated study, it was found that the revenue from cracker sales in India which remained fairly flat from 2002 to 2004, saw a sudden spike in 2005 before declining again in 2006. The solid line in the graph below refers to annual sale of crackers and the dashed line refers to the annual crow births in India. Choose the most appropriate inference from the above data. Reconstruction of the figure given with GA Q.10 — solid line: annual sale of crackers in India; dashed line: annual crow births in India (redrawn from the trend described in the question).

Options:

  • (A) There is a strong correlation between crow birth and cracker sales.
  • (B) Cracker usage increases crow birth rate.
  • (C) If cracker sale declines, crow birth will decline.
  • (D) Increased birth rate of crows will cause an increase in the sale of crackers.

Official Answer Key:

A

Step-by-Step Solution & Explanation

The two curves move together, so the statistical statement — a strong correlation — is supported by the data. Options (B), (C) and (D) all assert causation (or prediction based on causation). The question explicitly states the two studies are unrelated, so no causal mechanism is established. Correlation does not imply causation: this is exactly the distractor structure the examiner is testing.

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