The minimum sample size n required to estimate a population mean with 95% confidence and the desired margin of error 1.5 was found to be 198.Which of the following is the approximate value of the assumed estimate of the population standard deviation?
A) 10.7688
B) 12.8309
C) 115.9671
D) 164.6326

Question

Quizplus · Accepted Answer

The formula for sample size n is n = (Z*σ/E)^2. For 95% confidence, Z is approximately 1.96. Solving for σ with n = 198 and E = 1.5 gives σ ≈ 10.7688.

The Minimum Sample Size N Required to Estimate a Population