Managerial Statistics Practice test


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1) 4. Which of the following measures of central tendency tends to
be most influenced by an extreme score?

2) If A and B are mutually exclusive events then
3) If two events (both with probability greater than 0) are mutually exclusive, then
4) 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?
5) 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
6) Which one of these variables is a binomial random variable?
7) Which of the following is not a property of a binomial experiment?
8) If you are told a population has a mean of 25 and a variance of 0, what must you conclude?
9) 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?
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) 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?
12) A workforce consists of seven workers. How many different three worker teams is it possible to select?
13) An experiment consists of making 80 telephone calls in order to sell a particular insurance policy. The random variable in this experiment is a
14) 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?
15) Which one of these variables is a continuous random variable?


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