monfils 418_hypothesis testing2-2014

Usingztotesth0 calculatez cont step4drawconclusion

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Unformatted text preview: Means
have
stayed
at
3.00
throughout‐‐except
 for
minor
sampling
error
 •  Standard
devia$ons
have
decreased
 appropriately
 •  Shapes
have
become
more
normal‐‐see
 superimposed
normal
distribu$on
for
 reference
 Tes$ng
Hypotheses:
σ
known
 •  Use
z
from
normal
distribu$on
 •  Sampling
distribu$on
would
be
normal
 Research
ques$on:
 Is
7.10
enough
larger
than
5.65
to
conclude
that
 video
affected
results?
 Step
1:
State
Hypothesis
 H0:

Mean
=
5.65
 H1:

Mean ≠
5.65
 Calculate
p (sample
mean)
=
7.10
if

 µ
=
5.65
 Step
1:
State
Hypothesis
 H0:

Mean
=
5.65
 H1:

Mean ≠
5.65
(Two‐tailed)
 Calculate
p (sample
mean)
=
7.10
if

 µ
=
5.65
 Step
2:
Set
Cri$cal
Region
 Step
2:
Set
Cri$cal
Region
 •  Alpha
=
.05
 •  N
=
100
 •  From
table
A.2
we
see
that
the
cri$cal
value
 for
a
t...
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This note was uploaded on 04/02/2014 for the course PSY 418 taught by Professor Haley during the Spring '08 term at University of Texas.

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