Determine The Minimum Required Sample Size If You Want To Be 95 Confident. Determine the minimum required sample size if you want to be 95 confident that the sample mean is within one unit of the population mean given the standard deviation 48. The confidence interval also called margin of error is the plus-or-minus figure usually reported in newspaper or television opinion poll results.
Feb 25 2010 Determine the minimum required sample size if you want to be 95 confident that the sample mean is within 3 units of the population mean given sigma 78 Assume population is normally distributed. In this formula MOE is the number representing the margin of error you want and z is the z -value corresponding to your desired confidence level from the below table. Find the minimum sample size required to estimate the population proportion.
Determine the minimum sample size required when you want to be 98 confident that the sample mean is within two units of the population mean.
Assume a population standard deviation of 755 in a normally distributed population. If i want to construct a 95 confidence interval for the true population mean I need to estimate the standard deviation of the sample mean as s 04 sqrt 100 004. For example allowing 1 defect in the sample will require a sample size of 93 for the 95 reliability statement. Assume the population standard deviation is 303 milligrams.
