8. (07.02 LC) A student working on a report about psychiatrists decides to find

Question

8. (07.02 LC) A student working on a report about psychiatrists decides to find a 90% confidence inter a for the difference in mean age at e ime of sy ologic al discovery for Swiss psychiatrists versus Austrian psychiatrists. The student determines the ages at the time of psychological discovery for both groups, which include all Swiss and Austrian psychiatrists, and uses a calculator to find the 90% confidence interval based on the t distribution, why is this procedure not appropriate in this context? (4 points) The sample sizes for the two groups are not equal The entire population is measured in both cases, so the actual difference in means can be computed and a confidence interval should not be used Age at the time of psychological discovery occurs at different intervals in the two countries, so the distribution of ages cannot be the same. Age at the time of psychological discovery is likely to be skewed rather than bell shaped, so the assumptions for using this confidence interval formula are not valid. Age at the time of psychological discovery is likely to have a few large outliers, so the assumption for using this confidence interval formula is not valid.

Explanation / Answer

Ans:

As,entire population is measured in both caes(all swiss and austrian psychiatrists),so actual mean difference can be calcuated and confidence interval should not be used.

(Confidence interval is used to estimate parameter,when we can not meausre all of the population.)

second option is correct.

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