Question

Question: Data is collected on the frequency of mountain bird songs at three different elevations. Data is collected from 100 birds at each elevation.
Low altitude: 80 below 1500 Hz
Medium altitude: 50 below 1500 Hz
High altitude: 20 below 1500 Hz
How does altitude relate to song frequency of birds? (1 point)

Answer Choices:

( ) Altitude does not affect bird song frequencies.

( ) Medium altitude has medium frequency songs.

( ) Higher altitudes are correlated with lower song frequencies.

( ) Higher altitudes are correlated with higher song frequencies.

Answer 1

(X) Higher altitudes are correlated with higher song frequencies.

Reason: the percent of birds with songs below 1500 Hz drops from 80% (low) to 50% (medium) to 20% (high), so higher elevations have more songs above 1500 Hz.