RT Book, Section
A1 Glantz, Stanton A.
SR Print(0)
ID 57410608
T1 Chapter 3. How to Test for Differences between Groups
T2 Primer of Biostatistics, 7e
YR 2012
FD 2012
PB The McGraw-Hill Companies
PP New York, NY
SN 978-0-07-178150-3
LK accessbiomedicalscience.mhmedical.com/content.aspx?aid=57410608
RD 2024/04/20
AB Statistical  methods  are  used  to  summarize  data  and  test  hypotheses  with  those  data.  Chapter  2  discussed  how  to  use  the  mean,  standard  deviation,  median,  and  percentiles  to  summarize  data  and  how  to  use  the  standard  error  of  the  mean  to  estimate  the  precision  with  which  a  sample  mean  estimates  the  population  mean.  Now  we  turn  our  attention  to  how  to  use  data  to  test  scientific  hypotheses.  The  statistical  techniques  used  to  perform  such  tests  are  called  tests  of  significance;  they  yield  the  highly  prized  P  value.  We  now  develop  procedures  to  test  the  hypothesis  that,  on  the  average,  different  treatments  all  affect  some  variable  identically.  Specifically,  we  will  develop  a  procedure  to  test  the  hypothesis  that  diet  has  no  effect  on  the  mean  cardiac  output  of  people  living  in  a  small  town.  Statisticians  call  this  hypothesis  of  no  effect  the  null  hypothesis.