Calculate Sample Size Using Confidence Interval
Calculate Sample Size Using Confidence Interval. Then we can find the sample size to yield . This statistics video tutorial explains how to calculate the sample size given the confidence level and margin of error.
It deals with how confident you want to be that the actual mean falls within your . ((1.96)2 (0.5) (0.5)) / (0.05)2 = 385. The margin of error portion of a confidence interval formula can also be used to estimate the sample size that needed.
What sample size should you use for a survey in a city with a population of 120,000 people?
((1.96)2 (0.5) (0.5)) / (0.05)2 = 385. You want to have a confidence level of 95%. So a random sample of 385 households in our target population should be enough to give us the confidence levels we need. For example, if you used a 95 percent confidence level, meaning that you can say .
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