Studies have shown that prepared childbirth classes

a. do not produce healthier mothers and babies than regular medical practice.
b. lengthen labor.
c. produce healthier mothers and babies than regular medical practice.
d. increase the use of pain medications during labor.

Answer: a. do not produce healthier mothers and babies than regular medical practice.

Psychology

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For an independent-measures experiment comparing two treatment conditions with a sample of n = 10 in each treatment, what are the correct df values for the F-ratio?

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