Mathematics, 13.02.2020 20:34, jaustin1961
Determine the minimum sample size required when you want to be 99% confident that the sample mean is within 0.50 units of the population mean. Assume a standard deviation of 2.9 in a normally distributed population.
a. 130
b. 224
c. 223
d. 129
Answers: 1
level, that is the subtraction of 1 by the confidence interval divided by 2. So:
.
, so 
is the standard deviation of the population and n is the size of the sample.
So
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