Chapter 4: Q166SE (page 281)
Find a-score, call it, such that
a.
b.
c.
d.
Short Answer
a.
b.
c.
d.
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Chapter 4: Q166SE (page 281)
Find a-score, call it, such that
a.
b.
c.
d.
a.
b.
c.
d.
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Public transit deaths. Millions of suburban commuters use the public transit system (e.g., subway trains) as an alter native to the automobile. While generally perceived as a safe mode of transportation, the average number of deaths per week due to public transit accidents is 5 (Bureau of Transportation Statistics, 2015).
a. Construct arguments both for and against the use of the Poisson distribution to characterize the number of deaths per week due to public transit accidents.
b. For the remainder of this exercise, assume the Poisson distribution is an adequate approximation for x, the number of deaths per week due to public transit accidents. Find and the standard deviation of x.
c. Based strictly on your answers to part b, is it likely that more than 12 deaths occur next week? Explain.
d. Find. Is this probability consistent with your answer to part c? Explain.
Which of the following describe discrete random variables, and which describe continuous random variables?
a. The number of damaged inventory items
b. The average monthly sales revenue generated by a salesperson over the past year
c. Square feet of warehouse space a company rents
d. The length of time a firm must wait before its copying machine is fixed
Find each of the following probabilities for the standard normal random variable z:
Suppose x is a normally distributed random variable with = 11 and = 2. Find each of the following:
a)
b)
c)
d)
e)
f)
Blood diamonds. According to Global Research News (March 4, 2014), one-fourth of all rough diamonds produced in the world are blood diamonds, i.e., diamonds mined to finance war or an insurgency. (See Exercise 3.81, p. 200.) In a random sample of 700 rough diamonds purchased by a diamond buyer, let x be the number that are blood diamonds.
a. Find the mean of x.
b. Find the standard deviation of x.
c. Find the z-score for the value x = 200.
d. Find the approximate probability that the number of the 700 rough diamonds that are blood diamonds is less than or equal to 200.
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