Results for this submission The answer above is NOT correct. (1 point) Find the minimum sample size needed to be 99% confident that the sample standard deviation is within 40% of the population standard deviation. HINT: Use Table 7.2 at page 338. KEY ELEMENTS Finding the Sample Size Required to Estimate a Population Mean Objective Determine the sample size 11 required to estimate the value of a population mean pt. Notation ,u. = population mean E = desired margin of error 0' = population standard deviation 7.0/2 = z score separating an area of a / 2 in the right i = sample mean tail of the standard normal distribution Requirement The sample must be a simple random sample. Sample Size The required sample size is found by using Formula 7-4. a- 2 Fonnula7-4 n = [] Round-Off Rule If the computed sample size n is not a whole number, round the value of u up to the next larger whole number