Mathematics, 18.10.2019 21:10 lekingbrian9285
If the estimated population standard deviation based on previous studies is 20 percent, the acceptable error is plus or minus 5 percent, and the z-value for a 95 percent level of confidence is 1.96, the needed sample size is approximately:
Answers: 1
is the standard deviation, 
is the quantile of the normal distribution with area of 
and 
is the acceptable error. 
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If the estimated population standard deviation based on previous studies is 20 percent, the acceptab...
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