<prompt> The Hb level is healthy women has mean 13.5 gdl and standard detion 1.5 gdl, what is the Z score for a woman with Hb level 15.0 gdl :91021  <response>: Z-score indicates how much an observation is bigger or smaller than mean in units of S.D. Z Observation - MeanS.D Z 15-13.51.5 1 Ref: Parks Textbook Of Preventive And Social Medicine By K. Park, 19th Edition, Page 702; Parks Textbook Of Preventive And Social Medicine By K. Park, 18th Edition, Page 647; Methods in Biostatistics: For Medical Students and Research Workers By BK Mahajan, Page 82; High-Yield Biostatistics, By Anthony N. Glaser, Page 15 