8.Ais a graphical representation of sample space, sets, and events a. histogram

Question

8.Ais a graphical representation of sample space, sets, and events a. histogram b. stem-and-leaf diagram c. Venn diagram d. boxplot 9. For a given sample space of an experiment, a random variable is any rule that associate a number with each outcome in the sample space. a b. is any observed outcome that is not assigned to a category c. has a value between 0 and 1. d. is an arbitrary value assigned to multiple outcomes in the sample space. 10. The homogenous trials is based on discrete random variables of a fixed number of dichotomous, independent, a. b. c. Uniform probability distribution. Binomial probability distribution Normal probability distribution. 11. Poisson distribution a. is an approximation of the Binomial distribution when the number of trials is very large and the probability of success of each trial is very small. b. is more suitable for rare events c can incorporate the time dimension d. all of the above. 12. The probability distribution of continuous random variables is defined using a. probability mass function b. probability density function. c. uniform distribution function. d cumulative distribution function. 13. The cumulative distribution function of a continuous random variable X is a. the sum of the probabilities of all discrete random variables less than x. b. the area under the density curve to the left of X. c. the area under the density curve to the right of x. d, the probability value of X. 14. The curve of the standard normal distribution a. b. c. d. has a bell shaped curve. is also referred to as z-curve. is symmetrical. all of the above. 15. A point estimate of a parameter is a. a single number that can be regarded as a sensible value for the parameter b. obtained by selecting a suitable statistic and computing its value from the given sample data. c. both a and b. d. none of the above.

Explanation / Answer

8) C - VENN diagram shows sample space, sets and events

9) A -

10) B - dicotomous => 2 values => binomial (0 and 1, yes and no, etc.)

11) D - all of the above

12) B - DENSITY as it is continuous function.

13) B - sum of probabilities of x being < X (area under the curve on LEFT)

14) D - all of the above

15) C - both a and b

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