Managerial Statistics Practice test


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1. Which of the following is not a property of a binomial experiment?
2. 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
3. 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:
4. If two events (both with probability greater than 0) are mutually exclusive, then
5. If you are told a population has a mean of 25 and a variance of 0, what must you conclude?
6. A Tyre Company stocks three brands of tyre: brand X; brand Y and brand Z. 40% are Brand X, 35% are brand Y and 25% are brand Z. The percentage of defective tyres are 2% of brand X, 1% of brand Y and 3% of brand Z. If a tyre is picked at random what is the probability that it is defective?
7. Which one of these variables is a continuous random variable?
8. Nearly all the distributions are special cases of Poisson distribution
9. 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?
10. A workforce consists of seven workers. How many different three worker teams is it possible to select?
11. 4. Which of the following measures of central tendency tends to
be most influenced by an extreme score?

12. Which one of these variables is a binomial random variable?
13. The number of suicides reported in a particular city will be described by
14. 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?
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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