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10. You are conducting an experminet to test the hypothesis that dairy cows will give more milk if they listen to classical music while being milked. Your 20 experimental cows listen to classical music during milking; you collect all their milk and measure how much there is. Your 20 control group cows should have all experimental conditions identical to the experimental cows except:
a) they should listen to classical music at a louder volume.
b. they should listen to classical music all the time, not just during milking.
c) they should listen to a different type of music, like heavy metal.
d) they should not listen to any music.
e) they should not be milked.
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