:= Question Help 2 A doctor wants to éstimate the HDL cholesterol of all 20-to 2

Question

:= Question Help 2 A doctor wants to éstimate the HDL cholesterol of all 20-to 29-year-old females. How many subjects are needed to estimate th HDL cholesterol within points with 99% confidence assuming . Suppose the doctor would be content with 95% confidence. How does the decrease in confidence affect the sample size required, 15. A 99% confidence level requires subjects. (Round up to the nearest whole number as needed.) A 95% confidence level requires subjects. . Round up to the nearest whole number as needed.) How does the decrease in confidence affect the sample size required? 0 A. The lower the confidence level the larger the sample size. O B. The sample size is the same for all levels of confidence. ° C. The lower the confidence level the smaller the sample size.

Explanation / Answer

Solution:-

E=z*s/sqrt n solved for n is n = (z*s/E)^2.

Substitute for s and E: n = (z*15.7/3)^2

Find the z-value for a 99% CI: 2.575 = (2.575*15.7/3)^2 = 181.59 = 182(rounded)

Find the z-value for a 95% CI: 1.96 =  (1.96*15.7/3)^2 =  105.21 = 105(rounded)

=> option C. The lower the confidence level the smaller the sample size

Related Questions

Navigate

• Browse (All)
• Browse #
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.