Statistics work:Need in 30 hours
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th th e F te s t in E q u a tio n 4
- 3 n o t to b e s ig n ifi c a n tly d i
ff n ts . T h e s ta n d a r d d e v ia tio n s a r e s l
- 0 . 2 8 a n d 8 2 -
e m e a n s a re i , - 3 6 . 14 a n d li2
- 3 6 . 2 0 m M w ith n i
e n c e le v e t, th e tw o r e s u į ts a r e c o n s id e re d to b
e s i : e s o f h e e d o m . Iï th e c a ıc u ia te
d t is g re a te r tha n the
atio n 4 - 5 is to b e c o m p a re d w ith th e v a lu e o
f t in T a - li2 is u s e d in E q u a tio n
4 - 5 s o th a t t is a l w a y
s p o s le d s ta n d a r d d e v ia tio n m a k in g
u s e o f b o th s e t s o f
S p o o \e d
° -
n \ + n 2
- 2
SX n r ņ sx n 2 1
, - X
m th e fo rm u la
s e ts c o n s is tin g o f n ı a n d n 2 m e a s u re m e n ts (w ith a v e n
te lls u s th a t th e tw o s ta n d a r d d e v ia tio n s a r e n o t s ig n ifi
a n tly d iffe re n t fro m e a c h o th e r. W e a n s w e r th is
q u e stio r
b le 4 - 2 a n d a s k w h e th e r th e tw o m e a n v a lu e s o f 3 6 . \
D e v ia tio n s A re N o t S ig n ific a n u y D ìĦe re n t