For Questions 31-32 You go back two years later and see the following pattern 20

Question

For Questions 31-32 You go back two years later and see the following pattern 2014 data Beak size in centimeters Question 31 "Assuming of this trait and the selection on the underlying genes?" that your statistical tests are significant, what might you say about the evolution a It looks like NEGATIVE selection has decreased beak size! b) It looks like POSITIVE selection has decreased beak size! c) It looks like NEGATIVE selection has increased beak size! d) it looks like POSITIVE selection has increased beak sizel e) Nothing Question 32 What statistical test might you use to show that a shift in mean beak length occurred a) F-test b) T-test c) Chi-squared test d) Mann-Whitney U test el None of the above

Explanation / Answer

Observation of the plot - Positive selection has decreased beak size because you can see from the bar chart that the beak size increases 9 where it reaches its maximum and then goes on decreasing. This confirms that answer to 31 is b).

32. b) t test of means will be used to test the shift in mean beak size.

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