Unformatted text preview: sd
n Point estimate is the
sample mean of the
difference Statistical Inference about the Difference
between Two Population Means: Matched
Samples
Difference Between
Population Means
μd point estimator d standard error Hypothesis Tests parameter σd = sd
n margin of error tα 2 sd
n interval estimate d ± tα 2 degrees of
freedom n1
− sd
n Standard error based
on the standard
deviation of the
differences Statistical Inference about the Difference
between Two Population Means: Matched
Samples
Difference Between
Population Means
μd point estimator d standard error Hypothesis Tests parameter σd = sd
n margin of error tα 2 sd
n interval estimate d ± tα 2 degrees of
freedom n1
− sd
n Margin of error and
Interval Estimate
based on point
estimate, standard
error, and tdistribution Statistical Inference about the Difference
between Two Population Means: Matched
Samples
Difference Between
Population Means
μd point estimator d standard error Hypothesis Tests parameter σd = sd
n margin of error tα 2 sd
n interval estimate d ± tα 2 degrees of
freedom n1
− sd
n
Degrees of freedom is
based on the number
of differences Example Hypothesis Tests A Winnipeg
based company
has documents
that must be
quickly
distributed to
district offices
throughout
Canada. The
firm must
decide between
two delivery
services, UPX
and INTEX, to
transport its
documents.
How can...
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 Spring '13
 Standard Deviation, Statistical hypothesis testing, UPX

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