A study comparing attitudes toward death was conducted in which organ donors (in

Question

A study comparing attitudes toward death was conducted in which organ donors (individuals who had signed organ donor cards) were compared with nondonors. The study is reported in the journal "Death Studies". Templer's death anxiety scale (DAS) was administered to both groups. On this scale, high scores indicate high anxiety concerning death. The results were reported as follows:

n Mean Std. Deviation
Organ Donors 25 5.36 2.91
Nonorgan Donors 69 7.62 3.45

Construct the 95% confidence interval for the difference between means

Explanation / Answer

Given a=0.05, |Z(0.025)|=1.96 (check normal table)

So 95% CI is
(xbar1-xbar2) ± Z*[s1^2/n1 +s2^2/n2]

--> (5.36-7.62) ± 1.96*sqrt(2.91^2/25 + 3.45^2/69)

---> ( -3.66, -0.86)

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