Did the randomization work? After randomly assigning subjects to treatmentsin a
Chapter 0, Problem 23.34(choose chapter or problem)
Did the randomization work? After randomly assigning subjects to treatmentsin a randomized comparative experiment, we can compare the treatment groupsto see how well the randomization worked. We hope to find no significantdifferences among the groups. A study of how to provide premature infants with asubstance essential to their development assigned infants at random to receiveone of four types of supplement, called PBM, NLCP, PL-LCP, and TG-LCP.16(a) The subjects were 77 premature infants. Outline the design of theexperiment if 20 are assigned to the PBM group and 19 to each of the othertreatments.(b) The random assignment resulted in 9 females in the TG-LCP group and11 females in each of the other groups. Make a two-way table of group by genderand do a chi-square test to see if there are significant differences among thegroups. What do you find?
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