This preview shows page 1. Sign up to view the full content.
Unformatted text preview: ation Mean Difference Between 2
Population Means parameter μ D = μ1 – μ2 point estimator x d x− 2
=1 x standard error
Hypothesis Tests margin of error
interval estimate σx =
zα 2 σ
n σ
n x ±z 2
α σ=
d
z2
α σ
n σ2 σ 2
1
2
n
1 + n2 σ2 σ 2
1
2
n
1 d ±z 2
α + n2 σ2 σ 2
1
2
n
1 + n
2 As always, the margin of error is determined by the
sampling distribution and standard error Statistical Inference about the Difference
between Two Population Means (σ1 and σ2
known)
Population Mean Difference Between 2
Population Means parameter μ D = μ1 – μ2 point estimator x d x− 2
=1 x standard error
Hypothesis Tests margin of error
interval estimate σx =
zα 2 σ
n σ
n x ±z 2
α σ=
d
z2
α σ
n σ2 σ 2
1
2
n
1 + n2 σ2 σ 2
1
2
n
1 d ±z 2
α + n2 σ2 σ 2
1
2
n
1 + n
2 As always, the interval estimate is found by adding and
subtracting the margin of error from the point estimate Example
Par, Inc. is a manufacturer of golf equipment and has developed a new
golf ball that has been designed to provide “extra distance.” Par would like
to demonstrate that their n...
View Full
Document
 Spring '13

Click to edit the document details