Give a 99.9% confidence interval, for
μ
1
−
μ
2
\displaystyle \mu_{{1}}-\mu_{{2}}
μ
1
−
μ
2
given the following information.
n
1
=
45
\displaystyle {n}_{{1}}={45}
n
1
=
45
,
x
‾
1
=
2.41
\displaystyle \overline{{x}}_{{1}}={2.41}
x
1
=
2.41
,
s
1
=
0.71
\displaystyle {s}_{{1}}={0.71}
s
1
=
0.71
n
2
=
20
\displaystyle {n}_{{2}}={20}
n
2
=
20
,
x
‾
2
=
2.3
\displaystyle \overline{{x}}_{{2}}={2.3}
x
2
=
2.3
,
s
2
=
0.86
\displaystyle {s}_{{2}}={0.86}
s
2
=
0.86
Rounded both solutions to 2 decimal places.
±
\displaystyle \pm
±
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