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QMB 2100 QUIZ #5: Business and Economic Statistics I






1. An experiment consists of determining the speed of automobiles on a highway by the use of radar equipment. The random variable in this experiment is a



a. discrete random variable



b. continuous random variable



c. complex random variable



d. simplex random variable





2. Variance is



a. a measure of the average, or central value of



a random variable



b. a measure of the dispersion of a random






c. the square root of the standard deviation



d. the sum of the squared deviation of data



elements from the mean





3. A measure of the average value of a random



variable is called a(n)



a. variance



b. standard deviation



c. expected value



d. coefficient of variation





4. For a uniform probability density function,



a. the height of the function cannot be larger



than one



b. the height of the function is the same for



each value of x



c. the height of the function is different for



various values of x



d. the height of the function decreases as x








5. The probability that a continuous random



variable takes any specific value



a. is equal to zero



b. is at least 0.5



c. depends on the probability density function



d. is very close to 1.0





6. The z score for the standard normal distribution



a. is always equal to zero



b. can never be negative



c. can be either negative or positive



d. is always equal to the mean





7. A value of 0.5 that is added and/or subtracted



from a value of x when the continuous normal



distribution is used to approximate the discrete



binomial distribution is called



a. 50% of the area under the normal curve



b. continuity correction factor



c. factor of conversion



d. all of the alternatives are correct answers





8. Larger values of the standard deviation result in



a normal curve that is



a. shifted to the right



b. shifted to the left



c. narrower and more peaked



d. wider and flatter





9. A negative value of Z indicates that



a. the number of standard deviations of an



observation is to the right of the mean



b. the number of standard deviations of an



observation is to the left of the mean



c. a mistake has been made in computations,



since Z cannot be negative



d. the data has a negative mean



10. For the standard normal probability distribution,



the area to the left of the mean is



a. -0.5



b. 0.5



c. any value between 0 to 1



d. 1





11. Which of the following is not a characteristic of



the normal probability distribution?



a. The mean, median, and the mode are equal



b. The mean of the distribution can be



negative, zero, or positive



c. The distribution is symmetrical



d. The standard deviation must be 1





12. In a standard normal distribution, the range of



values of z is from



a. -3.09 to 3.09



b. -1 to 1



c. 0 to 1



d. minus infinity to infinity





13. The probability density function for a uniform



distribution ranging between 2 and 6 is



a. 4



b. undefined



c. any positive value



d. 0.25


Paper#61574 | Written in 23-Dec-2015

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