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A production facility employs 10 workers on the day shift, 8 workers on the swing shift, and 6 workers on the graveyard shift. A quality control consultant is to select 4 of these workers for in-depth interviews. Suppose the selection is made in such a way that any particular group of 4 workers has the same chance of being selected as does any other group (drawing 4 slips without replacement from among 24).
(a) How many selections result in all 4 workers coming from the day shift? Selections
What is the probability that all 4 selected workers will be from the day shift? (Round your answer to four decimal places.)
(b) What is the probability that all 4 selected workers will be from the same shift? (Round your answer to four decimal places.)
(c) What is the probability that at least two different shifts will be represented among the selected workers? (Round your answer to four decimal places.)
(d) What is the probability that at least one of the shifts will be unrepresented in the sample of workers? (Round your answer to four decimal places.)
on the average there are 5 messages sent per hour to a computer bulletin board. on a period of three hours find the
iq data is thought to be normally distributed with a mean of 100 and a standard deviation of 15. using the emperical
Find the usual summary measure that tells approximately how far from average these weights are.
A lottery offers one $1000 prize, two $500 prizes, and five $100 prizes. One thousand tickets are sold at $3.50 each. What was the expected value of a ticket?
Suppose the manager agrees to pay each employee a? $50 bonus if they meet a certain goal. On a typical? Saturday, the? oil-change facility will perform
sixty percent of all vehicles examined at a certain emissions inspection station pass the inspection. assuming that
A tollbooth operator has observed that cars arrive randomly at and average randomly at an average rate of 360 cars per hour. (Hint use a Poisson Distribution).
Describe a where you might want to use a dummy variable in a multiple regression. What would the dummy variable buy you in that situation?
Errors. An auto parts company advertises that its special oil additive will make the engine "run smoother, cleaner, longer, with fewer repairs."
5.54 A random sample of 20 students yielded a mean of x¯ = 72 and a variance of s2 = 16 for scores on a college placement test in mathematics. Assuming the scores to be normally distributed, construct a 98% con- ?dence interval for s2.
Throughout history 55% of registered voters actually have cast a ballot. What is the probability that among a group of 28 students who are registered voters more than 19 will vote?
a researcher placed male rodents in the presence and absence of a conspecific male. cortisol a stress hormone levels
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