Managerial Statistics Practice test


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1) If you are told a population has a mean of 25 and a variance of 0, what must you conclude?
2) The number of suicides reported in a particular city will be described by
3) If two events (both with probability greater than 0) are mutually exclusive, then
4) Which one of these variables is a continuous random variable?
5) If A and B are mutually exclusive events then
6) TATA Company stocks three brands: brand A; brand B and brand C. 40% are Brand A, 35% are brand B and 25% are brand C. The percentage of defective are 2% of brand A, 1% of brand B and 3% of brand C. If the company selects a product and finds it defective find the probability that it is a brand C product?
7) Which of the following is not a property of a binomial experiment?
8) Suppose that the probability of event A is 0.2 and the probability of event B is 0.4. Also, suppose that the two events are independent. Then P(A|B) is:
9) Nearly all the distributions are special cases of Poisson distribution
10) Assuming that Birthdays are uniformly distributed through out the week, the probability that two strangers passing each other on the street were both born on Monday is
11) which of the following is a correct statement?
12) A randomly selected sample of 400 students at a university with 15-week semesters was asked whether or not they think the semester should be shortened to 14 weeks (with longer classes). Forty six percent (46%) of the 400 students surveyed answered "yes." Which one of the following statements about the number 46% is correct?
13) Suppose that a quiz consists of 20 True-False questions. A student hasn't studied for the exam and will just randomly guesses at all answers (with True and False equally likely). How would you find the probability that the student will get 8 or fewer answers correct?
14) Which one of these variables is a binomial random variable?
15) Let A and B be events such that P (A) = 0.7 and P (B) = 0.9. Calculate the largest possible value of P (A ∪ B) − P (A ∩ B).


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