The normal approximation to the binomial distribution is most useful for finding which of the following?
a. The probability P(X = k) when X is a binomial random variable with small n.
b. The probability P(X k) when X is a binomial random variable with large n.
c. The probability P(X = k) when X is a normal random variable with small n.
d. The probability P(X k) when X is a normal random variable with large n.
Question 2
A randomly selected sample of 60 mathematics majors spent an average of 200.00 for textbooks one term, while during the same term, a randomly selected sample of 40 literature majors spent an average of 180.00 for textbooks. The standard deviation for each sample was 20.00 . The standard error for the difference between the two sample means is
a. 0.057
b. 4.082
c. 5.744
d. 16.663
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