Sample size estimation for smart watch users

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Sample size estimation for smart watch users

Statistics Sample Size Estimate Z-score Cochran's Formula

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Hi, 

What sample size is required to estimate the proportion of U.S. adults who wear a smart watch with 95% confidence within a 3% error rate? A survey taken one year ago indicated that 15% of all adults wore a smart watch.
Note: the z-score for a 95% confidence interval is 1.96.


 

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