The probability that the sample man should not differ by population mean by more than a/2 units is 0.95, where σ is the population standard deviation. For the validity of the statement, what should be the size of the sample?
Select one:
a. 18
b. 16
c. 12
d. 20
(Chebyshev's Theorem) The probability that any random variable will assume a value within standard deviations of the mean is at least
That is,
Then
d. 20
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