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Stripes of Leaves (MSR)

GMAT-1HJYEG

Description of Research Project on Striped Tree Leaves

The average number of stripes recorded during years 4, 8 and 12 are as follows:

Year 4 8 12
Low Rainfall Environment (mean) 13.6 11.2 7.5
Margin of error for mean of low rainfall environment 2.2 1.6 3.4
High Rainfall Environment (mean) 14.1 19.3 23.6
Margin of error for mean of high rainfall environment 2.4 1.5 0.8

Consider each of the following statements. Does the information in the three sources support the inference as stated?

Yes

No

Yes

No

The mean number of stripes in the high rainfall environment is conclusively higher than the mean number of stripes in the low rainfall environment after 4 years.

Yes

No

Trees in the high rainfall environment seem to have decreasing genetic variability in the number of stripes over time.

Yes

No

The divergence in the number of stripes between the original environment at 0 years and the specialized environment at 12 years is greater for trees that ended up in the high rainfall environment than those that ended up in the low rainfall environment.