Find what sample size should be taken?
Product yield was 86% before an improvement was made. To determine if a 3% change (in either direction) has been made at the 95% confidence level, what sample size should be taken?
OPTIONS
- 514
- 3671
- 110
- 86
ANSWER
514
EXPLANATION
For this, we would need to use the Binomial formula n = Z2 *p-bar*(1-p-bar)/(tolerance)2 n = (1.96)2 * (0.86) * (0.14)/(0.03)2 n = 514
