00319nam a2200121Ia 4500008004100000040001600041041001200057082002100069100002000090245004500110260002500155300001700180230917s9999||||xx |||||||||||||| ||und||  e10640aMAIN  aEnglish  a519.502415 M992R  aMyers, Jerome L 0aResearch design and statistical analysis  bHarper Collinsc1991  axvii,713p p.