Answer: This is because they are less powerful than parametric procedures.
Explanation:
Non-parametric procedures are not as powerful as parametric procedures. Non-parametric procedures do not depend on assumptions about the shape or form of the probability distribution from which the data is extracted. A parametric test has more statistical power than non-parametric test. Some conditions of validity are required for the result of a parametric test to be reliable
The parents would have to report what good place could study overnight and see how bad the sleep apnea is and if necessary to get checked and see if the mother have been doing things during her pregnancy with the infant causing that to happen
The answer is All of the above