Silicone implant augmentation rhinoplasty is used to correct congenital nose def

Question

Silicone implant augmentation rhinoplasty is used to correct congenital nose deformities. The success of the procedure depends on various biomechanical properties of the human nasal periosteum and fascia. An article reported that for a sample of 17 (newly deceased) adults, the mean failure strain (%) was 25.0, and the standard deviation was 3.3.

(a) Assuming a normal distribution for failure strain, estimate true average strain in a way that conveys information about precision and reliability. (Use a 95% confidence interval. Round your answers to two decimal places.)

( ____ %, ______%) The answer is not 26.69% and 23.30%

Explanation / Answer

Since a normal distribution is assumed for failure strain, use z statistic

For 0.05 significance level, zcrit = 1.96

95% CI = Mean +/- zcrit * SD/sqrt(N) = 25 +/- 1.96*3.3/sqrt(17) = (23.4313, 26.5687)

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