25
QuizMultiple Choice

Comparing Box Plots — Unit test

Question 25 • Math 7 B (M12 25/26 S2)

Monique manages wildlife samples for Ducks Unlimited. Two samples of duck populations at a migratory site are shown in the table below. Which statement about the samples is true?Duck Pond SamplesSample 1Sample 2Mallard17Mallard21Wood Duck8Wood Duck7Green Wing Teal10Green Wing Teal8American Widgeon5American Widgeon6

Answer
A
Monique can use both samples to find the mean frequency of each duck.
B
Monique should take another sample because there is too much variability in the two samples.
C
Monique should use only the first sample to find the mean frequency of each duck.
D
Monique should use only the second sample to find the mean frequency of each duck.

Explanation

The counts in the two samples are reasonably close for each duck type: mallards are 17 and 21, wood ducks 8 and 7, green-winged teal 10 and 8, and American widgeons 5 and 6. Monique can average each pair to estimate the mean frequency—for example, the mallard mean is (17 + 21) ÷ 2 = 19. The samples do not show such large differences that she needs to discard one or take another sample.

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