In the following sample size formula, which level of confidence is being used? 2.58^2/n=(90x10)/5^2

In the following sample size formula, which level of confidence is being used?
2.58^2/n=(90x10)/5^2



A) 90%
B) 95%
C) 99%
D) 68%
E) none of the above


Answer: C


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