Howtosignalprocessing
- How do you find the minimum sample size for a confidence interval?
- What is the minimum sample size needed for a 95 confidence interval?
- What is the minimum sample size needed for a 90 confidence interval?
How do you find the minimum sample size for a confidence interval?
Sample Size Computation for the Population Mean Confidence Interval. To determine the sample size, one first decides the confidence level and the half width of the interval one wants. Then we can find the sample size to yield an interval with that confidence level and with a half width not more than the specified one.
What is the minimum sample size needed for a 95 confidence interval?
To be 95% confident that the true value of the estimate will be within 5 percentage points of 0.5, (that is, between the values of 0.45 and 0.55), the required sample size is 385. This is the number of actual responses needed to achieve the stated level of accuracy.
What is the minimum sample size needed for a 90 confidence interval?
Answer: For a 90% CI with margin of error ≤3%, when you think one population's proportion is 37% and the other's is 47%, you need a sample of at least 1450 from each group.
