Question
Assume the sample is a random sample from a distribution that is reasonably normally distributed and we are
doing inference for a sample mean. Find endpoints of a
-distribution with
beyond them in each tail if the
sample has size
.
Round your answer to three decimal places.
endpoints
i
doing inference for a sample mean. Find endpoints of a
sample has size
Round your answer to three decimal places.
endpoints
Ask by Murphy Lee. in the United States
Mar 18,2025
Upstudy AI Solution
Tutor-Verified Answer
Answer
Endpoints = ±2.567
Solution
-
Since the sample size is
, the degrees of freedom for the -distribution is -
We want to find endpoints such that
of the probability lies in each tail. This means we are looking for the critical values with tail areas in the lower tail and in the upper tail. -
The lower endpoint is given by the
quantile: By symmetry, the upper endpoint is: -
Thus, the endpoints are:
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The Deep Dive
To find the endpoints of a
-distribution with
beyond them in each tail for a sample size of
, we first determine the degrees of freedom, which is
. Next, since we want
in each tail, we are looking for the critical values that correspond to
and
in the cumulative distribution function.
Using a
-distribution table or calculator, we find that the critical value at
for
in the left tail is approximately
and for
in the right tail is approximately
.
Thus, the endpoints are
.
Endpoints