2 pts In a study examining the effect of zinc and vitamin E supplementation on oxddative stress in elder women, participants are randomized into the following groups:
-600m(g)/()day of zinc and
400I(U)/()day vitamin E
-600m(g)/()day of zinc and
1,000I(U)/()day vitamin E
.0m(g)/()day of zinc and
400l(U)/()week vitamin E
-0m(g)/()day of zinc and
1,000l(u)/()day vitamin E What type of design is this?
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2\times 2factorial design 203 factorfat destigh
2\times 4factorial design
3\times 3fertortat decten