Virtual University
Superior university
Q1: In a standard normal distribution, which of the following is true?
A) P(Z > 2.0) = 0.9772
B) P(Z < -2.0) = 0.0228
C) P(-2.0 < Z < 2.0) = 0.9544
D) P(Z = 2.0) = 0.0228
Q2: The correlation coefficient:
A) makes the scatterplot redundant.
B) should be interpreted alongside the relevant scatterplot.
C) can be expressed as a percentage.
D) all of these.
Q3: If, in a binomial distribution, ‘p’ is less than 0.5, the distribution will be:
A) symmetrical.
B) leptokurtic.
C) skewed to right.
D) skewed to left.
Q4: If X and Y are independent random variables, then E(XY) is equal to:
A) E(X) + E(Y)
B) E(X)E(Y)
C) E(X) – E(Y)
D) [E(X)]2
Q5: If, in a Poisson process, on average, 4 calls are received per minute, then the set of possible values for the number of calls received in a 15-second interval is:
A) 0, 1, 2
B) 3, 4, 5, …
C) 0, 1
D) 0, 1, 2, 3
Q6: The mean of a binomial distribution is equal to:
A) npq
B) p
C) npq
D) np
Q7: The mean of the probability distribution of a random variable X is technically known as:
A) Variance of X
B) Standard deviation of X
C) Mean
D) None of these
Q8: If the second moment-ratio of a distribution is 2.144, then the distribution is:
A) leptokurtic.
B) mesokurtic.
C) Flatter than normal distribution
D) more peaked than the normal distribution.
Q9: The mean and standard deviation of the standard normal distribution are:
A) 1 and 0 respectively
B) 0 and 2 respectively
C) 0 and 1 respectively
D) 1 and 1 respectively
Q10: If X and Y are two random variables with the following joint p.d.f, then X and Y are:
A) Dependent
B) Independent
C) Positively correlated
D) Negatively correlated