Question: A random variable X follows a normal distribution with standard deviation = 8. We take a random sample of 25 individuals from the population and

A random variable

X

follows a normal distribution with standard deviation

= 8. We

take a random sample of 25 individuals from the population and we calculate a con dence

interval for

to be

(36.7136, 43.2864)

. What is the con dence level of this interval?

(A) 90%

(B) 95%

(C) 96%

(D) 98%

(E) 99%

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