A confidence interval is mathematically equivalent to its corresponding
hypothesis test. The hypothesis test is significant if the corresponding
confidence interval does not contain the parameter value of the null
hypothesis. The confidence interval does not contain the parameter value
of the null hypothesis if the hypothesis test is significant. Hence,
wether you calculate the confidence interval or conduct the hypothesis
test, doesn't really matter.
mean(X) +/- t * sd/sqrt(n): confidence interval for the expected value
of X, mu, X normally distributed with unknown population variance
t = (mean - mü0)/ (sd/sqrt(n)) : test statistic for testing if mu equals
the value in the null hypothesis, mu0, X normally distributed with
unknown population variance
If mü0 is not contained in the confidence interval, the hypothesis test
is significant.
Dr. Oliver Walter
Am 12.10.2018 um 15:01 schrieb Mark Hancock:
I unfortunately don't know enough about PSPP syntax to suggest how to
do this, but a CI is *not* always associated with a hypothesis and can
be calculated from just a mean and SD (and a cumulative distribution
function, which is typically the normal one). Typically the formula is
something like:
mean ± z(SD/sqrt(n)), where z is from the CDF.
On Fri, Oct 12, 2018 at 6:29 AM John Darrington
<j...@darrington.wattle.id.au <mailto:j...@darrington.wattle.id.au>>
wrote:
The confidence interval is a concept associated with a hypothesis.
If it's the confidence interval on the test for a mean value,
typically you
would get that by using a T-Test.
On Fri, Oct 12, 2018 at 10:40:22AM +0200, Werner LEMBERG wrote:
Folks,
I would like to get a 95% confidence interval so that I could
use it
in AGGREGATE, e.g.,
AGGREGATE OUTFILE * MODE ADDVARIABLES
/BREAK=...
/Mean = mean(V)
/CI = ci(V, 0.95)
What must I do to get the result of my hypothetical `ci'
function?
I'm a PSPP novice, so maybe there is a better solution than
AGGREGATE
??? what I ultimately want is to emit the confidence interval
of a
variable to a CSV file using SAVE TRANSLATE.
Werner
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