Question
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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

Ask by Murphy Lee. in the United States
Mar 18,2025

Upstudy AI Solution

Tutor-Verified Answer

Answer

Endpoints = ±2.567

Solution

  1. Since the sample size is , the degrees of freedom for the -distribution is
  2. 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.
  3. The lower endpoint is given by the quantile:
    By symmetry, the upper endpoint is:
  4. Thus, the endpoints are:

Answered by UpStudy AI and reviewed by a Professional Tutor

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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

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