Many birds are injured or killed by flying into windows. It appears that birds d

Question

Many birds are injured or killed by flying into windows. It appears that birds don’t see windows. Can tilting windows down so that they reflect earth rather than sky reduce bird strikes? Researchers placed six windows at the edge of a woods: two vertical, two tilted 20 degrees, and two tilted 40 degrees during the next four months, there were 53 bird strikes, 31 on the vertical windows 4 on the 20-degree windows, and 8 on the 40-degree windows. Does the tilt have effect?

a) Define and perform a hypothesis test.

Explanation / Answer

H0: tilt do not have effect

Ha: tilt have effect

Test statistic, ² = (O-E)²/E = 29.628

df = k - 1 = 3 - 1 = 2

let = 0.05

Critical value = 5.991

Since test statistic is greater than critical value, reject null hypothesis. There is sufficient evidence to support the claim that the tilt have effect.

Window O E=43/3 (O-E)²/E Vertical 31 14.33 19.3798 20-degree 4 14.33 7.4496 40-degree 8 14.33 2.7984 SUM 43 43 29.628

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