Managerial Statistics Practice test

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1. If A and B are mutually exclusive events then
2. 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?
3. 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?
4. Which one of these variables is a binomial random variable?
5. Which of the following is not a property of a binomial experiment?
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. 4. Which of the following measures of central tendency tends to
be most influenced by an extreme score?

8. Which one of these variables is a continuous random variable?
9. which of the following is a correct statement?
10. 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:
11. Nearly all the distributions are special cases of Poisson distribution
12. If two events (both with probability greater than 0) are mutually exclusive, then
13. The number of suicides reported in a particular city will be described by
14. 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).
15. A workforce consists of seven workers. How many different three worker teams is it possible to select?

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