A statistics practitioner would like to estimate a population mean to within 50 units with 99% confidence given that the populat
ion standard deviation is 250. What sample size should be used
1 answer:
Answer:
Step-by-step explanation:
Using the sample size formula
n= (zs/e)²
z is the z score at 99% = 2.58
s is the standard deviation = 250
e is the sample mean = 50
Substitute
n = (2.58×250/50)²
n = (2.58×5)²
n = (12.9)²
n=166.41
hence the sample size is 166.41
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