Posted by Rob on Monday, March 7, 2011 at 8:02am.
An obstetrician maintains that preterm babies (gestation less than 37 weeks) have a higher variability of birth weight than do fullterm babies (gestation 3741 weeks). According to the National Vital Statistics Report, Vol. 48, No. 3, the birth weights of full time babies are normally distributed with a standard deviation of 505.6 grams. A random sample of 41 preterm babies results in a standard deviation of 840 grams. Test the obstetrician's claim that the variability in birth weight for preterm babies is more than that of fullterm babies, at the level of significance 0.01.
Any help on figuring this out would be greatly appreciated. Thanks for your time.

statistics  PsyDAG, Monday, March 7, 2011 at 10:40am
Use my information from your previous posts.