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Unformatted text preview: .e., for D0)? Specific Motors of Detroit has
developed a new automobile
known as the M car. 24 M cars
and 28 J cars (from Japan)
were road tested to compare
mpg performance. The sample
statistics are:
M Cars
Hypothesis Tests n
x
s J Cars 24 28 29.8 27.3 2.56 1.81 Difference Between 2
Population Means
parameter DM–J = μM – μJ point
estimate d x− 2
=1 x standard
error s 2 s22
sd = 1 +
n n2
1 margin of
error
interval
estimate s 2 s22
1
+
n n2
1 tα 2 d ±tα 2 degrees of df =
freedom ( s12
n1
22 s2 s22
1
+
nn
1
2
+ s2 2
n2 ) 2 ( )+ ( ) s1
1
n1 −1 n1 s2 2
1
n2 −1 n2 2 Example Given these samples, what is the
point estimate for the difference
between the 2 population means
(i.e., for D0)? Specific Motors 2 Detroit has
d = x1 − x of
developed a new automobile
= x M car.
known as theM − x J 24 M cars
and 28 J cars (from Japan)
= 29.8 − 27.3
were road tested to compare
mpg performance. The sample
= 2.5
statistics are:
M Cars
Hypothesis Tests n
x
s J Cars 24 28 29.8 27.3 2.56 1.81 Difference Between 2
Population Means
parameter DM–J = μM – μJ point
estimate d x− 2
=1 x standard
error s 2 s22
sd = 1 +
n n2
1 margin of
error
interval
estimate s 2 s22
1
+
n n2
1 tα 2 d ±tα 2 degrees of df =
freedom ( s12
n1
22 s2 s22
1
+
nn
1
2
+ s2 2
n2 ) 2 ( )+ ( ) s1
1
n1 −1 n1 s2 2
1
n2 −1 n2 2 Example Given these samples, what is the
standard error for the difference
between the 2 population means
(i.e., for D0)? Specific Motors of Detroit has
developed a new automobile
known as the M car. 24 M cars
and 28 J cars (from Japan)
were road tested to compare
mpg performance. The sample
statistics are:
M Cars
Hypothesis Tests n
x
s J Cars 24 28 29.8 27.3 2.56 1.81 Difference Between 2
Population Means
parameter DM–J = μM – μJ point
estimate d x −J= 5
=M x 2
. standard
error s 2 s22
sd = 1 +
n n2
1 margin of
error
interval
estimate s 2 s22
1
+
n n2
1 tα 2 d ±tα 2 degrees of
df =
freedom ( s12
n1
22 s2 s22
1
+
nn
1
2
+ s2 2
n2 ) 2 ( )+ ( ) s1
1
n1 −1 n1 s2 2
1
n2 −1 n2 2 Example Given these samples, what is the
standard error for the difference
between the 2 population means
(i.e., for D0)? Specific Motors of 2Detroit has
s12 automobile
developed a new+ s2
sd =
known as the M car. 24 M cars
n1 n 2
and 28 J cars (from Japan)
2
sM 2
were road=tested + s Jcompare
to
nM
nJ
mpg performance. The sample
statistics are: 2 .56 2 + 1 .81 2
=
24 M 0 .625
= Cars
Hypothesis Tests n
x
s 28 J Cars 24 28 29.8 27.3 2.56 1.81 Difference Between 2
Population Means
parameter DM–J = μM – μJ point
estimate d x −J= 5
=M x 2
. standard
error s 2 s22
sd = 1 +
n n2
1 margin of
error
interval
estimate s 2 s22
1
+
n n2
1 tα 2 d ±tα 2 degrees of df =
freedom ( s12
n1
22 s2 s22
1
+
nn
1
2
+ s2 2
n2 ) 2 ( )+ ( ) s1
1
n1 −1 n1 s2 2
1
n2 −1 n2 2 Example Given these samples, what is the
margin of error for 90% confidence of
the difference between the 2 population
means? Specific Motors of Detroit has
developed a new automobile
known as the M car. 24 M cars
a...
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This document was uploaded on 03/05/2014.
 Spring '13

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